Question
Pipe A can fill a tank in 12 hours. Pipe B can empty the
same full tank in 18 hours. If both pipes are opened together when the tank is empty, in how many hours will the tank be full?Solution
ATQ, Let capacity = 36 units (LCM of 12 and 18). A’s filling rate = 36/12 = 3 units/hour B’s emptying rate = 36/18 = 2 units/hour Net rate = 3 − 2 = 1 unit/hour Time = 36 / 1 = 36 hours
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