Question discussion

A tap can fill a tank in 6 hours, while a leak at the bottom can empty the full tank in 12 hours. If both are open, the tank will be filled…

A tap can fill a tank in 6 hours, while a leak at the bottom can empty the full tank in 12 hours. If both are open, the tank will be filled in

Correct answer: B

Explanation

Net filling rate = 1/6 − 1/12 = 1/12 of the tank per hour, so the tank fills in 12 hours.

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