To pipes A and B can fill an empty tank in 10 hours and 40 hours, respectively. If both the pipes are opened then it takes 1 hour, 20 minutes more to fill the tank, due to a leakage at the bottom. If the tank is full, how long will leakage alone take to empty it?

To pipes A and B can fill an empty tank in 10 hours and 40 hours, resp

1.	To pipes A and B can fill an empty tank in 10 hours and 40 hours, respectively. If both the pipes are opened then it takes 1 hour, 20 minutes more to fill the tank, due to a leakage at the bottom. If the tank is full, how long will leakage alone take to empty it?
A.	28 hours
B.	27 hours
C.	56 hours
D.	54 hours
Answer» D. 54 hours