document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=455412>Question 455412</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The grass of a school field needs to be cut<BR>\n" );
document.write( "Jack could mow it in 4 hours<BR>\n" );
document.write( "James could mow it in 5 hours<BR>\n" );
document.write( "Jerremy could mow it in 6 hours<BR>\n" );
document.write( "John could mow it in 8 hours<BR>\n" );
document.write( "How long would it take, if they all combined their efforts and worked at their individual rates, to cut all the grass?<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #312681 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=312681\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The grass of a school field needs to be cut<BR>\n" );
document.write( "Jack could mow it in 4 hours<BR>\n" );
document.write( "James could mow it in 5 hours<BR>\n" );
document.write( "Jerremy could mow it in 6 hours<BR>\n" );
document.write( "John could mow it in 8 hours<BR>\n" );
document.write( "How long would it take, if they all combined their efforts and worked at their individual rates, to cut all the grass?\r<BR>\n" );
document.write( "\n" );
document.write( "--------<BR>\n" );
document.write( "Let the combined time be \"x\" hrs.<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Equation:<BR>\n" );
document.write( "sum of individual rates = together rate<BR>\n" );
document.write( "1/4 + 1/5 + 1/6 + 1/8 = 1/x<BR>\n" );
document.write( "-----------------------------------<BR>\n" );
document.write( "Multiply thru by 120x to get:<BR>\n" );
document.write( "30x + 24x + 15x = 120<BR>\n" );
document.write( "69x = 120<BR>\n" );
document.write( "x = 120/69 ~ 1 hr 44 minutes<BR>\n" );
document.write( "=================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );