Question
A water tank has a capacity of 500 liters. A tap fills
the tank at a rate of 10 liters per minute, while another tap empties it at a rate of 5 liters per minute. If both taps are opened simultaneously, how long will it take to fill the tank completely?Solution
Net filling rate = Filling rate - Emptying rate = 10 - 5 = 5 liters/minute. Time to fill 500 liters = Capacity / Net rate = 500 / 5 = 100 minutes. Correct answer: B) 100 minutes
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