document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=276432>Question 276432</A>: <I><SPAN STYLE=\"word-break: break-all;\"> if it takes 10 hours to fill a pool and 20 hours to drain it, how long will it take to fill it if the drain is open? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #201452 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=201452\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> if it takes 10 hours to fill a pool and 20 hours to drain it, how long will it take to fill it if the drain is open?\r<BR>\n" );
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document.write( "It fills 1/10th. of the pool in one hour\r<BR>\n" );
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document.write( "It drains 1/20th of the pool in 1 hour.\r<BR>\n" );
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document.write( "In an hour actually the increase is 1/10-1/20<BR>\n" );
document.write( "1/20\r<BR>\n" );
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document.write( "with the drain open 1/20th of the pool is filled in one hour.\r<BR>\n" );
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document.write( "so to fill the pool it will take 20 hours \r<BR>\n" );
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