Question 997137
A swimming pool is filled through its inplet pipe and then emptied through its outlet pipe in a total of 8 hours. If water enters through its inlet and simultaneously allowed to leave through its outlet, the pool is filled in 7.50 hours. Find how long will it take to fill the pool wih the outlet closed. 
<pre>Time inlet pipe takes to fill pool = {{{highlight_green(3)}}} hours