Pipes and Cisterns Practice Test 2 with solutions

Question : 21 of 40

Marks: +1, -0

A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled?

7.2 hrs
6.5 hrs.
5 hrs.
4.5 hrs.

Validate

Solution:

In 1 hour the part filled by both the taps =

1/4 - 1/9

5/{36}

Hence, Both taps will fill the tank in =

{36}/5

hrs. = 7.2 hrs.

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