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A pump can fill a tank with water in 2 hours. Because of a leak, it took 7/3 hours to fill the tank. The leak can drain all the water of the tank in:




Work done by tank without leak in 1 hr=1/2(reciprocal)
work done by tank with leak in 1 hr=3/7
Work done by the leak in 1 hour =(1/2-3/7)=1/14

 Leak will empty the tank in 14 hrs.

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