Question
Pipe A fills a tank in 20 hours, Pipe B fills it in 30
hours, and a leak empties it in 60 hours. If all are opened together, in how many hours will the tank be filled?Solution
ATQ, Net rate = 1/20 + 1/30 - 1/60 LCM = 60 = 3/60 + 2/60 - 1/60 = 4/60 = 1/15 Time = 15 hours
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