Pipe A can fill a tank in 20 hours while pipe B alone can fill it in 30 hours and pipe C can empty the full tank in 40 hours. Ifall the pipes 1 are opened together, how much time will be needed to mak

Pipe A can fill a tank in 20 hours while pipe B alone can fill it i

1.	Pipe A can fill a tank in 20 hours while pipe B alone can fill it in 30 hours and pipe C can empty the full tank in 40 hours. Ifall the pipes 1 are opened together, how much time will be needed to mak
A.	15(1/2)hours
B.	17(1/7)hours
C.	10hours
D.	5(1/8)hours
Answer» C. 10hours

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