<PRE><B>Question 798922</B>
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If the fill pipe can fill the tank in *[tex \Large 7] minutes, then it can fill *[tex \Large \frac{1}{7}] of the tank in one minute.  Likewise the drain can empty *[tex \Large \frac{1}{9}] of the tank in one minute.  Hence, working against one another, given that *[tex \Large \frac{1}{7}\ &gt;\ \frac{1}{9}], *[tex \Large \frac{1}{7}\ -\ \frac{1}{9}] of the tank will fill in one minute.  Do the arithmetic and then take the reciprocal of the answer to get the number of minutes to fill the tank.


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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