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# PS - flow

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Manager
Joined: 23 Jan 2008
Posts: 108
Followers: 2

Kudos [?]: 82 [1] , given: 0

PS - flow [#permalink]

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31 Jan 2008, 19:14
1
KUDOS
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
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Manager
Joined: 21 Dec 2007
Posts: 96
Followers: 1

Kudos [?]: 14 [0], given: 0

Re: PS - flow [#permalink]

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01 Feb 2008, 08:27
1/30+1/20=1/x
(2+3)/60=1/x
5/60=1/x
x=12

SVP
Joined: 28 Dec 2005
Posts: 1562
Followers: 3

Kudos [?]: 158 [0], given: 2

Re: PS - flow [#permalink]

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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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# PS - flow

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