Pipes A and B can fill a tank in 10 hours and 15 hours, respectively, and pipe C can empty the filled tank in 20 hours. If all three pipes opened together, then in how many hours would the tank be filled?
Let the capacity of the tank (LCM of 10, 15 and 20) = 60 units
Efficiency of pipes A = 60/10 = 6 units/hour
Efficiency of pipes B = 60/15 = 4 units/hour
Efficiency of pipe C = 60/20 = 3 units/hour (outlet pipe)
Required time = hours
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