Pipes and Cisterns Practice Test 1 with solutions

Question : 36 of 40

Marks: +1, -0

A cistern can be filled by three pipes together in 12 minutes. The first two pipes can fill it in 15 minutes. Working alone, find the time taken by the third pipe to fill the cistern.

0.5 hour
1 hour
0.93 hour
0.76 hour
$3/4$ hour

Validate

Solution:

Part of cistern filled by the third pipe in 1 minute
=

1/{12}-1/{15}

{5-4}/{60}

1/{60}

So, the third pipe alone can fill the cistern in 60 minutes = 1 hour

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