A pump can fill a tank with 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
Choices.
A) 5 hours  B) 7 hours  C) 8 hours  D) 14 hours  E) 18 hours

Rationale: "work done by the leak in 1 hour = 1 / 2 - 3 / 7 = 1 / 14 . leak will empty the tank in 14 hrs . answer : d"
Answer: D