November 2020
Problem of the Month
Filling A Cistern
Submitted by Brijesh Dave
Pipe S can fill a cistern in 2 hours by itself and pipe K can fill a cistern in 3 hours.
Pipe Y can empty it in 5 hours.
Suppose that all the pipes are turned on at the same time when the cistern is completely empty.
How long will it take to fill?