A pump can fill a tank with a water in 2 hours. Because of a leak, it took 2x1/3 hours to fill the tank. The leak can drain all the water of the tank in	Choose the correct option:
A) 5 hrs B) 7 hrs C) 12 hrs D) 14 hrs E) None
Sol.   Work done by the leak in 1 hour = (1/2 - 3/7) = 1/14.   ∴ Leak will empty the tank in 14 hrs.   Answer 14 hrs
<result>D</result>
A pump can fill a tank with a water in 2 hours. Because of a leak, it took 2x1/3 hours to fill the tank. The leak can drain all the water of the tank in