A pump can fill a tank with water in 6 hours. Because of a leak, it took 12 hours to fill the tank. The leak can drain all the water in ?
Choose the correct choice from the following choices.
A) 12hr	B) 11hr	C) 13hr	D) 14hr	E) 16hr
Work done by the leak in 1 hour = 1/6 - 1/12 = 1/12   Leak will empty the tank in 12 hours   12hrnswer is 12hr
<result>A</result>
A pump can fill a tank with water in 6 hours. Because of a leak, it took 12 hours to fill the tank. The leak can drain all the water in ?