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

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DS Forum Moderator
Joined: 21 Aug 2013
Posts: 1412
Location: India
Pipe X, pipe Y and pipe Z are all inlet pipes which always operate at  [#permalink]

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19 Jul 2018, 10:28
1
00:00

Difficulty:

15% (low)

Question Stats:

86% (01:14) correct 14% (01:33) wrong based on 37 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.
Senior Manager
Joined: 08 Aug 2017
Posts: 279
Re: Pipe X, pipe Y and pipe Z are all inlet pipes which always operate at  [#permalink]

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19 Jul 2018, 17:15
2
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

Re: Pipe X, pipe Y and pipe Z are all inlet pipes which always operate at &nbs [#permalink] 19 Jul 2018, 17:15
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