Two pipes, A and B, can fill a tank in 6 hours and 8 hours respectively. If they are opened alternately for one hour, and A is opened first, how much time will it take to fill the tank?

Two pipes, A and B, can fill a tank in 6 hours and 8 hours respective

1.	Two pipes, A and B, can fill a tank in 6 hours and 8 hours respectively. If they are opened alternately for one hour, and A is opened first, how much time will it take to fill the tank?
A.	5 hours 50 minutes
B.	6 hours 50 minutes
C.	5 hours 45 minutes
D.	6 hours 45 minutes
Answer» E.