document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=231075>Question 231075</A>: <I><SPAN STYLE=\"word-break: break-all;\"> It takes 10 hours to fill a pool with water, and 20 hours to drain it. If the pool is empty and the drain is open, how long will it take to fill the pool? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #171078 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=171078\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> It takes 10 hours to fill a pool with water, and 20 hours to drain it. If the pool is empty and the drain is open, how long will it take to fill the pool?<BR>\n" );
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document.write( "Fill rate : 1/10 job/hr<BR>\n" );
document.write( "Drain rate: 1/20 job/hr<BR>\n" );
document.write( "Together rate: 1/x job/hr<BR>\n" );
document.write( "--------------------------------<BR>\n" );
document.write( "Equation:<BR>\n" );
document.write( "1/10 - 1/20 = 1/x<BR>\n" );
document.write( "Multiply thru by 20x to get:<BR>\n" );
document.write( "2x - x = 20<BR>\n" );
document.write( "x = 20 (number of hours required to fill the pool)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );