Question
A tank is filled by three pipes A, B, and C. Pipe A can
fill the tank in 12 hours, pipe B in 16 hours, and pipe C can empty the tank in 8 hours. If all three pipes are opened together, how long will it take to fill the tank completely?Solution
Net rate = 1/12 + 1/16 - 1/8 = (4 + 3 - 6)/48 = 1/48. Time = 48 hours. Correct option: a
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