Pipes and Cisterns Practice Test 1 with solutions

Question : 21 of 40

Marks: +1, -0

A cistern which could be filled in 9 hours takes one hour more to be filled owing to a leak in its bottom. If the cistern is full, in what time will the leak empty it?

70 hours
80 hours
90 hours
100 hours

Validate

Solution:

In 1 hour the part emptied by the leak =

1/9 - 1/{10}

1/{90}

Hence, the leak can empty the cistern in 90 hours.

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