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An electric pump can fill a tank in 3 hours. Because of a leak in ,the tank it took 3(1/2) hours to fill the tank. If the tank is full, how much time will the leak take to empty it ?

A. 20 hrs

B. 23 hrs

C. 30 hrs

D. 21 hrs

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Correct Answer : D.


       work done by the leak in 1 hour=(1/3)-(1/(7/2))=(1/3)-(2/7)=(1/21).


       The leak will empty .the tank in 21 hours.

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