A pump can fill a tank with water in 2 hours. Because of a leak, it took 2 hours to fill the tank. The leak can drain all the water of the tank in: Choose the correct choice:
A) 14 hrs  B) 15 hrs  C) 10 hrs  D) 20 hrs  E) 25 hrs
work done in 1 hr = 1/2-3/7 = 1/14   ==&gt;14 hrs   14 hrsNSWER 14 hrs
<result>A</result>
A pump can fill a tank with water in 2 hours. Because of a leak, it took 2 hours to fill the tank. The leak can drain all the water of the tank in: