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GMATprep water pumps ratio

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Manager
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Joined: 24 Jun 2006
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GMATprep water pumps ratio [#permalink] New post 16 Jul 2007, 13:28
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A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

100% (01:05) correct 0% (00:00) wrong based on 2 sessions
Two water pomps, working simultaneously at their respective constant rates, took exactly four hours to fill a certain swimming pool. If the constant rate of one pomp is 1.5 times that of the other, how many hours will it take to the fastest pomp alone to fill the pool?

A)5
B)16/3
C)11/2
D)6
E)20/3

OA later expln
Manager
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Joined: 24 Jun 2006
Posts: 130
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Re: GMATprep water pumps ratio [#permalink] New post 16 Jul 2007, 14:06
Fistail wrote:
E.

= 4 (1.5/2.5)
= 20/3


you are right i did it another way and your calculation seem more simple.
can you explain it
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Director
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Re: GMATprep water pumps ratio [#permalink] New post 16 Jul 2007, 14:47
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boubi wrote:
Two water pomps, working simultaneously at their respective constant rates, took exactly four hours to fill a certain swimming pool. If the constant rate of one pomp is 1.5 times that of the other, how many hours will it take to the fastest pomp alone to fill the pool?

A)5
B)16/3
C)11/2
D)6
E)20/3

OA later expln

3r/2+2/2 = 5r/2 = combined rate

5r/2(4) = 10r = pool capicity

3r/2 (t) = 10r ==> t = 20r/3
Re: GMATprep water pumps ratio   [#permalink] 16 Jul 2007, 14:47
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