Problema Solution
A hose can fill a fountain 12 minutes.When the fountain is full,the open drain can empty the fountain in 18 minutes.If the hose is on and the drain is open,how long will it take for the fountain to fill?
Answer provided by our tutors
In one minute the hose can fill 1/12 of fountain.
IN one minute the open drain can empty 1/18.
In one minute the fountain can fill (1/12-1/18) of fountain capacity.
=(6-4)/72
=2/72=1/36.
The fountain can be filled in 36/1 =36 minutes.