Pipes and Cisterns Practice Test 2 with solutions

Question : 11 of 40

Marks: +1, -0

A pipe can empty a full tank in

1 1/2

hours and another pipe can do this in half the time taken by the first pipe. Find the time taken to empty the full tank if both the pipes are opened simultaneously.

30 minutes
20 minutes
15 minutes
25 minutes
27 minutes

Validate

Solution:

Time taken by the first pipe =

1 1/2

hour = 90 minutes
Time taken by the other pipe = 45 minutes
Part of tank emptied by both in 1 minute
=

1/{90}+1/{45}

{1+2}/{90}

3/{90}

1/{30}

So, the time taken by both together = 30 minutes.

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