Question 101

Two pipes can fill up a tank respectively in 3 hours and 6 hours and a third pipe can empty a tank in 9 hours. If three of them are working together then how long will it take to fill up the tank?

Solution

Tank filled in an hour when all of them are working simultaneously = 1/3 + 1/6 - 1/9 = 7/18
Hence time taken to fill up the tank = 18/7 h

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