A pump can fill a tank with water in 2 hours. Because of a leak, it took 2 hours to fill the tank. The leak can drain all the water of the tank in:	Choose the correct choice from the following
A) 4 hours	B) 7 hours	C) 8 hours	D) 14 hours	E) 15 hours
Work done by the leak in 1 hour = (1/2 - 3/7) = 1/14   Leak will empty the tank in 14 hrs.   Answer = 14 hours
<result>D</result>
A pump can fill a tank with water in 2 hours. Because of a leak, it took 2 hours to fill the tank. The leak can drain all the water of the tank in: