Boats and Streams Shortcuts

Friends, today we are going to discuss another important topic of Aptitude section Boats and Streams. Before going to the topic, Let us know what is Downstream and what is Upstream. Because these concepts are the heart of Boats and Streams.

Downstream : In water,the direction along the stream is called downstream. I mean, If a boat or a swimmer swims in the same direction as the stream, then it is called downstream. Obviously the boat or swimmer require less efforts to travel using downstream. Because the stream itself helps the objects to move. 

Remember, as the object moves along with the water, the stream helps the object. 

So, the down stream speed (DS) is 

DS =  U+V

where U is the speed of the object in the still (calm) water

V is the speed of the water. 

Upstream : If the boat or the swimmer is swimming in the opposite direction in which the stream is passing is called upstream. In simple words, the direction against the stream is called upstream.

Remember, as the object moves against the water pushes the object in opposite direction. 

So, the upstream speed (US) is

US = U-V

where U is the speed of the object in the still (calm) water

V is the speed of the water. 

Important Formulas on Boats and Streams :

• Let us assume that the speed of the boat in still water is U km/hr and the speed of stream is V km/hr then, as mentioned above :
• Speed downstream = (u+v)km/hr
• Speed upstream = (u-v)km/hr
• If the speed downstream is a km/hr and the speed upstream is b km/hr then :
• Speed in still water = 1/2(a+b) km/hr
• Rate of stream = 1/2(a-b)km/hr

Let us do some problems on boats and streams :

1)A man can row upstream at 8kmph and downstream at 10kmph. Find the man's rate in still water and the rate of current.

Solution : Rate in still water = 1/2 (10+8)km/hr = 9km/hr

            Rate of current = 1/2(10-8)km/hr =1km/hr

2)A boat can travel with a speed of 12km/hr in still water . If the speed of the stream is 5km/hr , find the time taken by boat to go 68km downstream.

solution : Speed downstream = (12+5)km/hr  = 17 km/hr

             Time taken to travel 68km downstream = 68/17hrs  =4hrs

3)If a man rows at the rate of 5kmph in still water and his rate against the current is 3.5kmph, then man's rate along the current is ?

solutin : Let us consider the rate along the current be x kmph. 

              

          Then, 1/2(x+3.5) = 5  or X= 6.5 Kmph

4)A boat covers a certain distance downstream in 1 hour, while it comes back  in 3/2 hours. If the speed of the stream is 3kmph, what is the speed of the boaat in still water ?

Solution : Let the speed of the boat in still water be x kmph.

              

           Then speed downstream = (X+3)kmph

                Speed upstraem = (x-3)kmph

                  Therefore (X+3)*1 = (x-3)*3/2

                     2x+6=3x-9  => X= 15kmph 

5)A speed of a boat in still water is 10 km/hr. If it can travel 26km downstream and 14km upstream in the same time , the speed of the stream is ?

solution : let the speed of the stream be x km/hr. then,

           Speed downstream=(10+x)km/hr, 

            speed upstream= (10-x)km/hr

             Therefore  26/(10+x)= 14/(10-x)

              260-26x= 140+14x  => 40x=120

                 x=3km/hr

6)The speed of the boat in still water is 10km/hr and the rate of the current is 3 km/hr. The distance travelled downstream in 12 minutes is ?

solution : Speed downstream =(10+3)kmph= 13kmph

          Distance travelled = 13*12/60 = 2.4 kmph  

7)what is the speed of the boat in still water ?

i)The speed downstream of the boat is twice the speed upstream.

ii)The sum of the speeds of the boat , upstream and downstream is 12kmph

solution: Let the speed of the boat be x km/hr . Then

               i) Speed downstream = 2x km/hr

               ii)Says, the speed of the boat in still water = (1/2*12) = 6km /hr

8)A man can row upstream at 5kmph and downstream at 15kmph .The speed of the stream is ?

  Solution :    Speed of the stream = 1/2 (15-5) = 5kmph

9)A boat takes a total time three hours to travel downstreams from P to Q and the upstream back from Q to P. what is the speed of boat in still water ?

i)The speed of the river current is 1 km per hour

ii)The distance between P and Q is 4 km.

solution :  i) The speed of the current = 1km/hr

        

             ii)PO =4km

                let the speed of the boat in still water be x km/hr 

                    4/(x+1) +4/(x-1) =3 

10)A man takes twice long to row a distance against the stream as to row the same distance in favour of the stream .the ratio of the speed of the boat in still water is ?

solution : Let man's upstream be xkmph . then . his rate downstream =3x km/hr

             (Speed in still water) : (Speed of stream ) = (2x+x/2) : (2x-x/2) =3x/2 : x/2

              => 3:1

That's all for now friends. You can get more aptitude shortcuts here. Happy Reading :)

Mounika Rao

23:31 - By Unknown 0

 Baroda Rajasthan Kshetriya Gramin Bank Recruitment of Officers and Office Assistants

The Baroda Rajasthan Kshetriya Gramin Bank, a Regional Rural Bank of Rajasthan (head office Ajmer) sponsored by Govt of India, Govt of Rajasthan and Bank of Baroda) is inviting online applications from eligible Indian citizens who have appeared and qualified the Common Written Examination for RRBs conducted by IBPS in September 2012 for the recruitment of Officers Junior Management - Scale I Cadre and Office Assistants (Multipurpose). There are 500 posts in total. You can apply online from 30th July 2013 to 14th August 2013. 

Application Fee :

• Officer (Scale I)
• Rs. 20/- for SC/ST/PWD candidates.
• Rs.100/- for all others
• Office Assistant (Multipurpose) 
• Rs. 20/- for SC/ST/PWD/EXSM candidates.
• Rs.100/- for all others

Payment of Fee : 

There are two challan's available in Bank's website. You can pay via  Baroda Rajasthan Kshetriya Gramin Bank or Bank of Baroda.

Vacancy Details : 

S. No	Name of the Post	SC	ST	OBC	General	Total
1	Officers Scale I	22	11	40	77	150
2	Office Assistants (Multipurpose)	60	45	70	175	350

Age :

• For Officer Scale - I : Above 18 years - Below 28 years
• For Office Assistant : Between 18 years and 28 years

Required IBPS Score to Apply : 

For Office Assistants :

Name of the Test	Qualifying Standard Score
	SC/ ST/ SC-PWD/ ST-PWD/ SCEXS/ ST-EXS	OBC/ GEN/ OBC-PWD/ GEN-PWD/ OBC-EXS/ GEN-EXS
Reasoning	17 & above	19 & above
Numerical Ability	17 & above	19 & above
General Awareness	17 & above	19 & above
English Language or Hindi Language	17 & above	19 & above
Computer Knowledge	17 & above	19 & above
Cutoffs on Total Weighted Standard Score	89 & above	95 & above

For Officer Scale I

Name of the Test	Qualifying Standard Score
	SC/ ST/ SC-PWD/ ST-PWD	OBC/ GEN/ OBC-PWD/ GEN-PWD
Reasoning	17 & above	19 & above
Quantitative Aptitude	17 & above	19 & above
General Awareness	17 & above	19 & above
English Language or Hindi Language	17 & above	19 & above
Computer Knowledge	17 & above	19 & above
Cutoffs on Total Weighted Standard Score for Officer Scale-I	97 & above	103 & above

Check detailed notification of  Baroda Rajasthan Kshetriya Gramin Bank Recruitment from here

Download Challan of BRKGB from here

Download Challan of Bank of Baroda from here 

Apply Online from here 

23:30 - By Unknown 0

 LIC AAO Interview Schedule Out

Good News friends. The Life Insurance Corporation of India (LIC) has released the interview schedule of Assistant Administrative Officers (AAO). The interviews will be held in August and September months in Bhopal, Kolkata, Patna, New Delhi, Jaipur, Kanpur, Chennai, Hyderabad and Mumbai. The organization is mailing Individual Interview intimation letters to all the shortlisted candidates. You can check remaining details below. All the Best :)

Check the interview schedule and other details of LIC AAO Recruitment 2013 from here

Thanks to Manu and Raja Mohan Reddy for the update

23:30 - By Unknown 0

 Key with Explanations for the Sentence Correction Problems of English

Friends, here is the key with detailed explanations to our previous post on English Sentence Correction Practice Problems for Bank PO Exams. So we request you to read that post here and try to solve on your own before seeing the solutions below. We hope all of you are ready with your answers. Now lets have a look the the answers with explanations. The underlined part is the error. 

1. The things I told you has been done.

Here we are talking about things (plural). So we should use have been instead of has been. The correct sentence is The things I told you about have been done.

2. I do not know why I felt so grief. 

* Here grief means Deep Sorrow

There are two errors in this sentence,

You shouldn't use the word so.

Here is grief is noun. So you can't feel grief (grammatically incorrect). 

So you can say I do not know why I feel so sad (instead of grief)

3. The old lady is poor stricken. 

*here stricken means "affected by being poor (poverty)).

here poor is an adjective, stricken is also a noun. We can't put them together. Its grammatically incorrect. So you can use the noun form of poor (poverty) so the sentence will be The old lady is poverty stricken.

4. I will drink milk today morning.

The above sentence is grammatically incorrect. You should say I will drink milk this morning. 

Some important points to remember :

Today morning --> This morning

Yesterday morning --> Last morning

Tomorrow morning --> The coming morning.

5. He said he will unable to help me.

You should use the be form after will. So the correct sentence is He said he will be unable to help me.

6. Not only is Javed handsome but also he is very friendly.

The correct structure of the sentence will be Not only is Javed handsome, but he is also very friendly.

7. Thus I have been lived alone for the past two years.

Have been is there. So, there should be an ing form. So the correct sentence is,

Thus I have been living alone for the past two years.

Important Note : I've been observing that people often confuse about the usage of for and since. 

for is used when you give the time duration. 

ex : for the past two years. for the last two weeks etc.

since is used when you give the starting point of the time.

ex : since 1980, since 1st July 2013 etc

8. This chapter comprises of seven sections.

Comprises of is grammatically incorrect. You should say consists of or just comprises. So the correct form(s) of the sentence will be,

This chapter comprises seven sections.

This chapter consists of seven sections.

9. The man was sweating proficiently.

We use the proficiently when somebody is really good at it. 

Ex : proficient driver, proficient dancer, proficient in a foreign language etc. Sweating is not a skill :P So we shouldn't use proficiently here. 

You can use profusely here if you want to express Extravagant / Abundant.

One more important point to note : Now a days everybody using "sweating" while talking about humans. But grammatically its a blunder. We use sweating only for animals. For humans you should use the word perspire. 

Animals ---> Sweats / Sweating

Humanbeings --> Perspire / Perspiring

So you can write, The man is perspiring profusely

10. I also have been sick too.

Here also and sick, represent the same meaning. So you shouldn't use them both. Any one of them is enough. So you can say,

I have been sick too.

10:28 - By Unknown 0

 English Sentence Correction Practice Problems for Bank PO Exams

Friends, here are some problems on English Sentence Correction / Error Correction of higher difficulty level for IBPS PO and IBPS RRB PO Exams. What you have to do is, take a paper and write these sentences on it. Every sentence has some grammatical error in it. So you have to underline the part which is having error and you should correct form of the sentence below the given sentence. The allotted time for it is 15 minutes. After 15 minutes we will upload the key with detailed explanations so that you can check your answers.  What are you waiting for ? Just take a piece of paper and start answering these. All the Best. 

1. The things I told you has been done.
2. I do not know why I felt so grief. 
3. The old lady is poor stricken. 
4. I will drink milk today morning.
5. He said he will unable to help me.
6. Not only is Javed handsome but also he is very friendly.
7. Thus I have been lived alone for the past two years.
8. This chapter comprises of seven sections.
9. The man was sweating proficiently.
10. I also have been sick too.

Updae : Check the Key to the above questions with detailed explanations from here

10:28 - By Unknown 0

 Computer Software - Basics

Friends, in our last post we have discussed about computer Hardware. In this post we shall discuss about Computer Software. The Software is very important part of the computer that people cannot touch. Software is a set of programs that makes the computer run, and controlling everything that the computer does. 

Confused ? lets discuss with a small example. Assume that you were a new born baby. When you born there was nothing there in brain. It was just like a white paper. Later your parents, relatives, well wishers taught you THINGS. They give you instructions like This is good, This is Bad, you should do this, you shouldn't do that etc. Those instructions helps you to perform your tasks in an efficient manner. Have you ever heard of Tarzan? He was also a human being, but born and brought up in Forest. He just behaves like an animal, can't talk or think like human beings. You and he both have same type of brains. Then where is the difference? The difference lies in the instructions given by the people. In simple words, your brain programmed to survive in this civilized society but his brain didn't. Got the point? 

Now back to our topic, Computer is just like the human brain. Its of no use and it can't work if you don't give proper instructions to it. These of instructions are called Computer Program. The computer program helps the computer to perform a specific task. A program is said to be running / executing when the computer is using that program. A set of programs is called Software.

Softwares are of two types :

1. System Software
2. Application Software

The System software consists of low level (binary) programs that interact with the computer at the very basic level. Examples of system softwares are Operating Systems, Compilers and Utilities for managing computer resources (printer software, scanner software etc).

System Software Examples

The Application software consists of programs that are required for a user. The application software is also called End-user programs. Examples of application softwares are Emails, Word Processors, Spread sheets, Games etc. 

Application Softwares

Important Note : We cant run the application softwares without the help of System Softwares.

Synopsis :

Set of Instructions -----> Program

Set of Programs -------> Software

Programmer : The person who write programs / instructions.

Programming Language : The language in which the programmer write the instructions to train and work with computers.
Ex : C, C++, Java, SQL etc

Thats all for now friends. In our next post we shall discuss in detail about system and application softwares. You can read computer knowledge related topics from here. Happy Reading :) 

01:35 - By Unknown 1

 NICL 1434 Administrative Officers Recruitment Last Dates Extended

Friends, as you know the National Insurance Company Ltd (NICL) has issued a notification for recruitment of Administrative Officers (AOs) of behalf of four leading Public Sector General Insurance Companies (1. The New India Assurance Company Ltd, 2. Oriental Insurance Company Ltd, 3. United India Insurance Company Ltd, 4. National Insurance Company Ltd). Now it has extended the Application Date and changed the Cutoff Date for Educational Qualification. Now you can apply for the above mentioned posts till 12th August 2013 earlier it was 2nd August 2013. Check remaining details including detailed notification of the change below.

Company wise Vacancy List :

1. The New India Assurance Company Ltd - 494 Posts
2. Oriental Insurance Company Ltd - 223 Posts
3. United India Insurance Company Ltd - 294 Posts
4. National Insurance Company Ltd  - 423 Posts

Revised / Extended Dates :

• Last date for Online Registration - 12th August 2013 (earlier it was 2nd August)
• Last date for Payment of Fee - 14th August 2013 (earlier it was 7th August 2013)
• Cutoff Date for Educational Qualification - 10th August 2013 (earlier it was 31st July 2013)

Check the Notification of NICL AO Exam date amendment from here

Check the detailed notification of NICL AO Recruitment from here

04:08 - By Unknown 0