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 most appropriate option.
A) 5 hrs	B) 7 hrs	C) 12 hrs	D) 14 hrs	E) none

Rationale: "sol . 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