Asked by jy

Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, how long will it take to fill the tank from empty to full?
Answered by oobleck
How much water flows in or out during 1 hour? If the result indicates that the tank will fill in x hours, then
1/5 + 1/6 - 1/12 = 1/x
Now just solve for x
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