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Pipe X, pipe Y and pipe Z are all inlet pipes which always operate at

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Joined: 22 Aug 2013
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Pipe X, pipe Y and pipe Z are all inlet pipes which always operate at  [#permalink]

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New post 19 Jul 2018, 11:28
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A
B
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E

Difficulty:

  15% (low)

Question Stats:

90% (01:15) correct 10% (01:51) wrong based on 30 sessions

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Pipe X, pipe Y and pipe Z are all inlet pipes which always operate at their respective constant rates. These three pipes, if opened together, can fill an empty tank T in 8/3 hours. How long will it take pipe Y to fill the empty tank T at its constant rate, alone?

(1) Pipe Z can fill the empty tank T at its constant rate alone in 12 hours.

(2) Pipes X and Z can together fill the empty tank T at their respective constant rates in 4 hours.
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Joined: 09 Aug 2017
Posts: 193
Re: Pipe X, pipe Y and pipe Z are all inlet pipes which always operate at  [#permalink]

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New post 19 Jul 2018, 18:15
1
1/x +1/y + 1/z = 3/8

Statement 1
1/z= 1/12
Not sufficient

Statement 2
1/x + 1/z =1/4
Sufficient

B is answer.
GMAT Club Bot
Re: Pipe X, pipe Y and pipe Z are all inlet pipes which always operate at &nbs [#permalink] 19 Jul 2018, 18:15
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Pipe X, pipe Y and pipe Z are all inlet pipes which always operate at

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