Pipe A can fill a tank in 20 hours and pipe B can fill the same tank in 24 hours. Pipe C can empty the same tank in 12 hours. If all the pipes are opened together, then what portion of the tank will be filled after 12 hours?

Pipe A can fill a tank in 20 hours and pipe B can fill the same tank i

1.	Pipe A can fill a tank in 20 hours and pipe B can fill the same tank in 24 hours. Pipe C can empty the same tank in 12 hours. If all the pipes are opened together, then what portion of the tank will be filled after 12 hours?
A.	1/10
B.	1/5
C.	1/15
D.	9/11
Answer» B. 1/5

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Pipe A can fill a tank in 20 hours and pipe B can fill the same tank in 24 hours. Pipe C can empty the same tank in 12 hours. If all the pipes are opened together, then what portion of the tank will be filled after 12 hours?

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