A cistern is normally filled in 10 hours. However, it takes 12 hours when there is a leak in its bottom. If the cistern is full, in what time shall the leak empty it?
A
10 hours
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B
15 hours
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C
30 hours
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D
60 hours
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Solution
The correct option is D 60 hours Filling efficiency of the cistern without leak =110
Given, It takes 12 hours to empty the tank with leak, which means the efficiency =112
Let the emptying efficiency be 1x
Thus, 112=110−1x
Solving, x=60 hours.