document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=411522>Question 411522</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A farmer can plow a field in 12 hours by using one tractor. His son, using a different tractor can plow it in 10.5 hours. How long will it take the farmer and his son working together to plow the field? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #550600 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=550600\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1/a+1/b=1/x<BR>\n" );
document.write( "1/12+1/10.5=1/x<BR>\n" );
document.write( "10.5/126.0+12/126.0=1/x<BR>\n" );
document.write( "22.5/126.0=1/x<BR>\n" );
document.write( "x=126.0/22.5<BR>\n" );
document.write( "x=5.6 hours working together<BR>\n" );
document.write( "check<BR>\n" );
document.write( "x/a+x/b=1<BR>\n" );
document.write( "x/12+x/10.5=1<BR>\n" );
document.write( "5.6/12+5.6/10.5=1<BR>\n" );
document.write( "0.46666667+0.53333333=1<BR>\n" );
document.write( "1.0=1<BR>\n" );
document.write( "ok\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );