1)

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) $4\frac{1}{3}$

B) 7 hrs

C) 8 hrs

D) 14 hrs

Answer:

Option D

Explanation:

Work done  by the leak in $1$ hour $=\left(\frac{1}{2}-\frac{3}{7}\right)$  $=\frac{1}{14}$.

$\therefore$ Leak will empty the tank in 14 hours.