A pump can fill a tank with water in 2 hours. Because of a leak, it took 2 1/8 hours to fill the tank. The leak can drain all the water of the tank in?
Choose one:
A) 17 hr
B) 19 hr
C) 10 hr
D) 34 hr
E) 36 hr

Rationale: "work done by the tank in 1 hour = ( 1 / 2 - 2 1 / 8 ) = 1 / 34 leak will empty the tank in 34 hrs . answer : d"
Answer: D