Pipes and Cisterns Practice Test 1 with solutions

Question : 6 of 40

Marks: +1, -0

Two pipes A and B can fill a cistern in

37 1/2

minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if pipe B is turned off after:

Solution:

In 30 minutes the part filled by pipe A = 30 ×

2/{75}

4/5

The remaining part = 1 -

4/5

1/5

The time taken by pipe B to fill the remaining part =

{1/5}/{1/{45}}

= 9 minutes.

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