Pipe A can fill a tank in 4 hours whereas pipe B can empty it in 6 hours. If both the pipes are opened together then the number of hours needed for the tank to be filled is _____.

Pipe A can fill a tank in 4 hours whereas pipe B can empty it in 6 hou

1.	Pipe A can fill a tank in 4 hours whereas pipe B can empty it in 6 hours. If both the pipes are opened together then the number of hours needed for the tank to be filled is _____.
A.	8 hours
B.	9 hours
C.	10 hours
D.	12 hours
Answer» E.

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Pipe A can fill a tank in 4 hours whereas pipe B can empty it in 6 hours. If both the pipes are opened together then the number of hours needed for the tank to be filled is _____.

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