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 DExplanation: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.
