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WantGMAT800
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rank a question. my take it's 750-800 range 21 Feb 2011, 13:59
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Hello everybody!
I've recently started my GMAT journey. I've decided, as a first stage, to polish my skills with the tasks not written by GMAT people. Please, rank the question below and try to solve it if you have desire to.
Thanks in advance.

Hope I did a correct translation.
There are 3 pipes that flow a tank. It takes 5 h 20 m less time for the first and the second pipe together to fill the tank then for the first and the third together. If the second pipe flows in and the third one takes out water it will take 21/16 hours less for the tank to be filled then if the first and the second pipe together would fill a tank twice the size of existing one. How much time will it take for the first and the second pipe to fill the tank, if the first and the third pipe spend then 8 hours to make it full?



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fluke
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rank a question. my take it's 750-800 range 21 Feb 2011, 14:21
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WantGMAT800
Hello everybody!
I've recently started my GMAT journey. I've decided, as a first stage, to polish my skills with the tasks not written by GMAT people. Please, rank the question below and try to solve it if you have desire to.
Thanks in advance.

Hope I did a correct translation.
There are 3 pipes that flow a tank. It takes 5 h 20 m less time for the first and the second pipe together to fill the tank then for the first and the third together. If the second pipe flows in and the third one takes out water it will take 21/16 hours less for the tank to be filled then if the first and the second pipe together would fill a tank twice the size of existing one. How much time will it take for the first and the second pipe to fill the tank, if the first and the third pipe spend then 8 hours to make it full?
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Guess something wrong with the question;

There are 3 pipes that flow a tank. It takes 5 h 20 m less time for the first and the second pipe together to fill the tank then for the first and the third together.
How much time will it take for the first and the second pipe to fill the tank, if the first and the third pipe spend then 8 hours to make it full?

Ans: 8-(16/3) = 8/3 = 2 hours 40 minutes
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miguelmick
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Schools: MIT (Sloan) - Class of 2014
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rank a question. my take it's 750-800 range 21 Feb 2011, 19:03
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I also believe something is wrong with the question.
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WantGMAT800
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rank a question. my take it's 750-800 range 21 Feb 2011, 22:37
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fluke

Guess something wrong with the question;

There are 3 pipes that flow a tank. It takes 5 h 20 m less time for the first and the second pipe together to fill the tank then for the first and the third together.
How much time will it take for the first and the second pipe to fill the tank, if the first and the third pipe spend then 8 hours to make it full?

Ans: 8-(16/3) = 8/3 = 2 hours 40 minutes
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I may have gone wrong while translating :). What exactly makes you believe the question is wrong?
I've just noticed one mistake... it should be:
How much time will it take for the first and the second pipe together to fill the tank, if the first and the third pipe together spend more then 8 hours to make it full?
Should I post an answer?
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stanford2012
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rank a question. my take it's 750-800 range 22 Feb 2011, 01:38
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Let P1= time required for pipe #1, P2= time required for pipe #1 and P3 = time required for pipe #3.

It takes 5 h 20 m less time for the first and the second pipe together to fill the tank then for the first and the third together

I. P1 + P3 -(P1 + P2) = 5 1/3 => P2 + P3 = 5 1/3

How much time will it take for the first and the second pipe to fill the tank, if the first and the third pipe spend then 8 hours to make it full?

II. P1 + P3 = 8

Plug the expression into equation I => 8 - (P1 + P2) = 5 1/3 => P1 + P2 = 2 2/3 i.e. 2h 40 min



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!