document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=338726>Question 338726</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If it takes 15 minutes to fill a pool and 20 minutes to drain it, how long would it take to fill the pool if the drain is left open? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #242788 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=242788\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  If it takes 15 minutes to fill a pool and 20 minutes to drain it, how long would it take to fill the pool if the drain is left open?<BR>\n" );
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document.write( "Fill rate = 1/15 pool/min<BR>\n" );
document.write( "--<BR>\n" );
document.write( "Drain rate = 1/20 pool/min<BR>\n" );
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document.write( "Together rate = 1/x pool/min<BR>\n" );
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document.write( "1/15 - 1/20 = 1/x<BR>\n" );
document.write( "Multiply thru by 60x to get:<BR>\n" );
document.write( "4x - 3x = 60<BR>\n" );
document.write( "x = 60 minutes to fill the pool<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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