Pipe A can empty a filled tank in 5.6 hours while Pipe B can fill the same tank, when empty, in 7 hours. If Pipes A and B are alternately turned on for an hour each time, starting when the tank is full, how long will it take to empty the tank?

Pipe A can empty a filled tank in 5.6 hours while Pipe B can fill the

1.	Pipe A can empty a filled tank in 5.6 hours while Pipe B can fill the same tank, when empty, in 7 hours. If Pipes A and B are alternately turned on for an hour each time, starting when the tank is full, how long will it take to empty the tank?
A.	55 hours
B.	48 hours
C.	56 hours
D.	47 hours
Answer» E.

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Pipe A can empty a filled tank in 5.6 hours while Pipe B can fill the same tank, when empty, in 7 hours. If Pipes A and B are alternately turned on for an hour each time, starting when the tank is full, how long will it take to empty the tank?

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