Question

One pipe can fill a tank in 60 minutes and another pipe can fill it in 50 minutes .If these two pipes are open and a third pipe is draining water from the tank ,it take 35 minutes to fill the tank .How long will it take the third pipe alone to empty the tank?
how much of the tank's volume is filled/drained each minute?

1/60 + 1/50 - 1/x = 1/35
1/x = 17/2100
So, it will take 2100/17 = 123.5 minutes

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