<PRE><B>Question 749029</B>
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By itself, the inlet can fill the pool in 9 hours, so it can fill *[tex \LARGE \frac{1}{9}] of the pool in 1 hour.  Likewise, the drain can empty *[tex \LARGE \frac{1}{12}] of the pool in 1 hour.  Working against one another, the inlet and the drain fill *[tex \LARGE \frac{1}{9}\ -\ \frac{1}{12}] of the pool in 1 hour.  Do the arithmetic and then take the reciprocal to find the total time.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
&lt;font face=&quot;Math1&quot; size=&quot;+2&quot;&gt;Egw to Beta kai to Sigma&lt;/font&gt;
My calculator said it, I believe it, that settles it
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