Question
Two pipes, A and B, can independently fill the tank in
16 minutes and 20 minutes respectively, while pipe C can empty 5 gallons from the tank in 2 minutes. If all three pipes are operated simultaneously, and they manage to fill the tank in 10 minutes, what is the tank's capacity?Solution
Taking LCM of 16, 20 and 10 = 80 Efficiency of A = 5 Efficiency of B = 4 Efficiency of (A+B-C) = 8 Efficiency of C = (5 + 4) – 8 = -1 Pipe C empty the tank in = 80/1 = 80 min Capacity of the tank = 80 × (5/2) = 200 gallons
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