Question
Two pipes A and B can fill a tank in 15 hours and 18
hours, respectively. Both pipes are opened simultaneously to fill the tank. In how many hours will the empty tank be filled?Solution
Tank filled by Pipe A in 1 hour = 1/15 Tank filled by Pipe B in 1 hour = 1/18 Tank filled by both Pipes in 1 hour = (1/15) + (1/18) = 11/90 Time taken By both pipes to fill the tank = 90/11 = 8(2/11) hrs ∴ Time taken by both pipes is 8(2/11) hrs.
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