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PS - flow

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1 KUDOS received
Manager
Manager
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Joined: 23 Jan 2008
Posts: 108

Kudos [?]: 95 [1], given: 0

PS - flow [#permalink]

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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

Kudos [?]: 95 [1], given: 0

Manager
Manager
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Joined: 21 Dec 2007
Posts: 95

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

Re: PS - flow [#permalink]

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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

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

SVP
SVP
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Joined: 28 Dec 2005
Posts: 1549

Kudos [?]: 173 [0], given: 2

Re: PS - flow [#permalink]

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New post 01 Feb 2008, 12:35
wrong section, but my answer is 12 as well :)

Kudos [?]: 173 [0], given: 2

Re: PS - flow   [#permalink] 01 Feb 2008, 12:35
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