Pipe A can fill a tank in 12 hours and pipe B in 15 hours. A drain pipe C can empty the full tank in 20 hours. If all three are opened together, in how many hours will the tank be filled?

Question

Accepted Answer

10. Net rate = 1/12 + 1/15 − 1/20. Using LCM 60: 5/60 + 4/60 − 3/60 = 6/60 = 1/10. Time = 10 hours.

Pipe A can fill a tank in 12 hours and pipe B in 15 hours. A drain pipe C can empty the full tank in 20 hours. If all three are opened together, in how many hours will the tank be filled?

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