document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=909184>Question 909184</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Glenn can paint a classroom in 5 hours. His father can do it in 4 hours. How long will it take them if they work together? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #551716 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=551716\">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+1/5=1/x<BR>\n" );
document.write( "5/20+4/20=1/x<BR>\n" );
document.write( "9/20=1/x<BR>\n" );
document.write( "x=20/9 hours working together<BR>\n" );
document.write( "x=2.22222222 hours working together<BR>\n" );
document.write( "check<BR>\n" );
document.write( "x/a+x/b=1<BR>\n" );
document.write( "(20/9)/4+(20/9)/5=1<BR>\n" );
document.write( "5/9+4/9=1<BR>\n" );
document.write( "1.0=1<BR>\n" );
document.write( "ok<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );