document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=901579>Question 901579</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An inlet pipe can fill a tank in 6 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 #546789 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=546789\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Filling or draining a tank is 1 job\r<BR>\n" );
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document.write( "Filling 6 minutes<BR>\n" );
document.write( "so it does 1/6 of the job in 1 minute\r<BR>\n" );
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document.write( "draining -18 minutes<BR>\n" );
document.write( "so it does 1/18 of the job in 1 minute\r<BR>\n" );
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document.write( "If both are open effective rate will be\r<BR>\n" );
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document.write( "1/6 - 1/18\r<BR>\n" );
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document.write( "2/18\r<BR>\n" );
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document.write( "= 1/9\r<BR>\n" );
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document.write( "so 1/9 of the job is done in 1 minute\r<BR>\n" );
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document.write( "It will take 9 minutes to fill the tank </SPAN>\n" );
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