Pipes and Cisterns Practice Test 2 with solutions

Question : 8 of 40

Marks: +1, -0

A cistern can be filled by pipes A and B in 12 minutes and 10 minutes respectively. The full tank can be emptied by a third pipe C in 8 minutes only. If all the pipes be turned on at the same time, the cistern will be full in:

17 min.
$17 1/7$ min.
$17 2/7$ min.
18 min.

Validate

Solution:

In 1 minute the part filled by the three pipes =

1/{12}+1/{10}-1/8

7/{120}

Hence, all the three pipes will fill the cistern in

{120}/7

17 1/7

minutes.

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