One pipe can fill a tank in 14 hours. Another pipe can empty the filled tank in 18 hours. If both pipes are opened together, how much time will it take to fill the tank?

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Answer & Explanation

Correct AnswerA. 63

Quick Explanation

Net rate = 1/14 - 1/18 = 1/63 tank per hour. Time = 63 hours.

Net work rate = filling rate - emptying rate

Net rate = 1/14 - 1/18 = 1/63 tank per hour. Time = 63 hours.

Use the standard formula directly after identifying the quantities.

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