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Time and Work

Two pipes A a...

Question

Two pipes A and B can fill a tank in 20 and 16 hours respectively. Pipe B alone is kept open for 1/4 of time and both pipes are kept open for remaining time. In how many hours, the tank will be full?

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Solution

Let the required time be x hours, then
x/16+3x/80 = 1 x= 11=10 hours.

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