An inlet valve can fill a flask in 18 minutes. An outlet valve can drain the flask in 30minutes. How long would it take to fill the flask if both the valves were opened?

An inlet valve can fill a flask in 18 minutes. An outlet valve can drain the flask in 30minutes. How long would it take to fill the flask if both the valves were opened?

A 30 minutes

B 15 minutes

C 45 minutes

D 75 minutes

Solution

Correct Answer: Option C