A water tank is two-fifth full. Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely

A water tank is two-fifth full. Pipe A can fill a tank in 10 minute

1.	A water tank is two-fifth full. Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely
A.	4 min. to empty
B.	5 min. to fill
C.	6 min. to empty
D.	8 min. to empty
Answer» D. 8 min. to empty

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A water tank is two-fifth full. Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely

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