Pipes and Cisterns Practice Test 1 with solutions

Question : 12 of 40

Marks: +1, -0

Two taps A and B can fill a cistern in 30 minutes and 60 minutes respectively. There is a third exhaust tap C at the bottom of the tank. If all the taps are opened at the same time the cistern will be full in 45 minutes. In what time can exhaust tap C empty the cistern when full?

40 minutes
36 minutes
35 minutes
30 minutes

Validate

Solution:

In 1 minute the part emptied by exhaust tap C =

1/{30}+1/{60}-1/{45}

1/{36}

Hence, exhaust pipe C can empty the cistern in 36 minutes.

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