An electric pump can fill a tank in 3 hours. Because of a leak in the tank, it took 3 hours 30 min to fill the tank. The leak can drain out all the water of the tank in
10 hrs 30 min
Work done by the leak in 1 hour = (1/3) - (2/7) = 1/21.
Leak will empty the tank in 21 hours
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