document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=992470>Question 992470</A>: <I><SPAN STYLE=\"word-break: break-all;\"> One tractor can plow a field in 8 hours, and another in 10 hours. In how many hours can both tractors plow the field together ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #612159 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=612159\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1/x + 1/y = 1/z<BR>\n" );
document.write( "1/8 + 1/10 = 1/z<BR>\n" );
document.write( "5/40 + 4/40 = 1/z<BR>\n" );
document.write( "9/40 = 1/z<BR>\n" );
document.write( "9*z = 40*1<BR>\n" );
document.write( "9z = 40<BR>\n" );
document.write( "9z/9 = 40/9<BR>\n" );
document.write( "z = 40/9 = 4.444 (approximate)\r<BR>\n" );
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document.write( "It will take approximately 4.444 hours to plow the field together. </SPAN>\n" );
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