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
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?
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