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PS - flow

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Manager
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PS - flow [#permalink] New post 31 Jan 2008, 19:14
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At a constant rate of flow, it takes 20 minutes to fill a swimming pool if a large hose is used and 30 minutes if a small hose is used. At the constant rates, how many minutes will it take to fill the pool when both hoses are used simultaneously?

1. 10
2. 12
3.15
4.25
5. 50
Manager
Manager
Joined: 21 Dec 2007
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Re: PS - flow [#permalink] New post 01 Feb 2008, 08:27
1/30+1/20=1/x
(2+3)/60=1/x
5/60=1/x
x=12

answer=2
SVP
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GMAT Tests User
Re: PS - flow [#permalink] New post 01 Feb 2008, 12:35
wrong section, but my answer is 12 as well :)
Re: PS - flow   [#permalink] 01 Feb 2008, 12:35
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