A pump can fill a tank with water in 2 hours. Because of a leak, it took 2 1/5 hours to fill the tank. The leak can drain all the water of the tank in?	Choose the most appropriate option
A) 17 hr B) 19 hr C) 22 hr D) 24 hr E) 26 hr

Rationale: work done by the tank in 1 hour = ( 1 / 2 - 2 1 / 5 ) = 1 / 22 leak will empty the tank in 22 hrs . answer : c
Answer: C