A pump can fill a tank with water in 2 hours. Because of a leak, it took 2$ \dfrac{1}{3} $ hours to fill the tank. The leak can drain all the water of the tank in:
4$ \dfrac{1}{3} $hours
7 hours
8 hours
14 hours
Explanation:
Work done by the leak in 1 hour =$ \left(\dfrac{1}{2} -\dfrac{3}{7} \right) $=$ \dfrac{1}{14} $.
$\therefore$ Leak will empty the tank in 14 hrs.