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Question

A pump can fill a tank with water in 2 hours. Because of a leak in the tank, it takes 213 hours to fill the tank. The leak can empty the filled tank in

A
213 hours
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B
7 hours
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C
8 hours
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D
14 hours
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Solution

The correct option is C 14 hours
Part of the tank filled by the pump in 1 hour =12
Total part of the tank filled by the pump and leak in 1 hour =173=37

Part of the tank emptied by the leak in 1 hour =1237=7614=114
The leak will empty the tank in 14 hours.

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