A pump can fill a tank with water in 2 hours. Because of a leak, it took 2 1/3 hours to fill the tank. The leak can drain all the water of the tank in:
(1) 8 hours
(2) 7 hours
(3) 14 hours
(4) 4 hours
(1) 1
(2) 2
(3) 3
(4) 4
EXPLANATION
A (+) A – B B (-) Total work= 14
Time 2 7/3
Eff 7 6 1
Therefore, The leak can drain all the water of the tank in = 14/1= 14 hours
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