document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1124078>Question 1124078</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An inlet pipe can fill a tank in 15 minutes. A drain can empty the tank in 18 minutes. If the tank is empty, and both the pipe and drain are open, how long will it take before the tank overflows?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #740441 by </B><A HREF=/tutors/aboutme.mpl?userid=FrankM><B>FrankM(1040)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=FrankM><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/cgi-bin/show-face.mpl?user=FrankM><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=740441\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The fill rate is 4 tanks/hour\r<BR>\n" );
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document.write( "The drain rate is 3-1/3 tanks per hour. \r<BR>\n" );
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document.write( "The 'accumulation rate' is therefore 2/3 tank per hour, and it will take 1.5 hours to fill. \r<BR>\n" );
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document.write( "Proof - this is 90 minutes.  In 90 minutes, the inlet can fill the tank 6 times, but the drain will let 5 tanks out. <BR>\n" );
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