A pump can fill a tank with water in 2 hours. Because of a leak, it took $$2\frac{1}{3}$$ hours to fill the tank. The leak can drain all the water of the tank in:
a) $$4\frac{1}{3}$$ hours
b) 7 hours
c) 8 hours
d) 14 hours
Answer: d
Explanation: Work done by the leak in 1 hour
$$\eqalign{
& = {\frac{1}{2} – \frac{3}{7}} = \frac{1}{{14}} \cr} $$
Leak will empty the tank in 14 hours
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