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Pumps A, B, and C operate at their respective

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Manager
Manager
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Joined: 05 Aug 2008
Posts: 88
Schools: McCombs Class of 2012
Pumps A, B, and C operate at their respective  [#permalink]

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New post 03 Jan 2009, 22:43
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Intern
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Joined: 26 May 2008
Posts: 8
Location: Chicago, IL
Re: Work Problem  [#permalink]

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New post 03 Jan 2009, 22:57
1
1/a + 1/b = 5/6 ----- 1
1/a + 1/c = 2/3 ----- 2
1/b + 1/c = 1/2 ----- 3

adding the three equations we get

2(1/a + 1/b + 1/c) = 2
or 1/a + 1/b + 1/c = 1

So all three together takes 1 hour.
Manager
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Joined: 05 Aug 2008
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Schools: McCombs Class of 2012
Re: Work Problem  [#permalink]

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New post 04 Jan 2009, 00:12
thanks for the clear explanation. That is the correct answer.

--== Message from GMAT Club Team ==--

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If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Re: Work Problem &nbs [#permalink] 04 Jan 2009, 00:12
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