Question
A container is to be filled to the brim. Tap P takes 21 minutes to fill the container while Tap Q takes 4 minutes to fill it. How long will it take to completely fill the container with water if both the taps are turned on at the same time? Leave your answer in minutes and round off to 1 decimal place.
4 m

Click button first when a symbol is required. X

A container is to be filled to the brim. Tap P takes 21 minutes to fill the container while Tap Q takes 4 minutes to fill it. How long will it take to completely fill the container with water if both the taps are turned on at the same time? Leave your answer in minutes and round off to 1 decimal place.