document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=923219>Question 923219</A>: <I><SPAN STYLE=\"word-break: break-all;\"> One pipe fills a pool in 4 hours.  A second pipe, used to drain the water from the pool, can empty the pool in 8 hours.  The owner of the pool mistakenly opened both pipes.  How long will it take to fill the pool if one pipe is filling and the other pipe is emptying? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #559910 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=559910\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1/a+1/b=1/x<BR>\n" );
document.write( "1/4-1/8=1/x<BR>\n" );
document.write( "8/32-4/32=1/x<BR>\n" );
document.write( "4/32=1/x<BR>\n" );
document.write( "x=32/4<BR>\n" );
document.write( "x=8 hours working together<BR>\n" );
document.write( "check<BR>\n" );
document.write( "x/a+x/b=1<BR>\n" );
document.write( "x/4+x/-8=1<BR>\n" );
document.write( "8/4-8/8=1<BR>\n" );
document.write( "2-1=1<BR>\n" );
document.write( "1=1<BR>\n" );
document.write( "ok<BR>\n" );
document.write( "codewt<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );