Two taps A and B can fill a tank in 5 hours and 20 hours respectively. If both the taps are open then due to a leakage, it took 30 minutes more to fill the tank. If the tank is full, how long will it take for the leakage alone to empty the tank ?	Choose the most appropriate option
A) 8 hrs	B) 9 hrs	C) 18 hrs	D) 36 hrs	E) 33 hrs
2 taps can fill in 4 hrs   With leak it will take 4 1/2 hrs   now leak can empty in 1/4-1/(4 (1/2))   1/4-8/9=1/36. so it an empty tank in 36 hrs   ANSWER:36 hrs
<result>D</result>
Two taps A and B can fill a tank in 5 hours and 20 hours respectively. If both the taps are open then due to a leakage, it took 30 minutes more to fill the tank. If the tank is full, how long will it take for the leakage alone to empty the tank ?