Pipes and Cisterns Practice Test 1 with solutions

Question : 9 of 40

Marks: +1, -0

Two pipes A and B would fill a cistern in 20 and 34 minutes respectively. Both pipes being opened, find when the first pipe must be turned off so that the cistern may be just filled in 17 minutes?

10 min.
30 min.
17 min.
34 min

Validate

Solution:

The part of the cistern filled by B in 17 min =

1/{24} × 17

1/2

Remaining part = 1 -

1/2

1/2

Time taken by A to fill the remaining part =

{1/2}/{1/{20}}

= 10 min.
Hence, pipe A must be turned off after 10 minutes.

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