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# Pumps A, B, and C operate at their respective

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Manager
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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03 Jan 2009, 22:43
Attachment:

Q1.JPG [ 33.83 KiB | Viewed 901 times ]

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Intern
Joined: 26 May 2008
Posts: 8
Location: Chicago, IL

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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
Joined: 05 Aug 2008
Posts: 88
Schools: McCombs Class of 2012

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

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

This is not a quality discussion. It has been retired.

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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# Pumps A, B, and C operate at their respective

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