document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=200947>Question 200947</A>: <I><SPAN STYLE=\"word-break: break-all;\"> please help me solve this problem:<BR>\n" );
document.write( " a farmer and his son leave a barn at the same time and walk in opposite driections checking a fence line. the son walks at the speed of 3.5km/h and the farmer at 4.0km/h. how much time will have elapsed when the farmer and his son are 2.5km apart </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #151187 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=151187\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a farmer and his son leave a barn at the same time and walk in opposite driections checking a fence line. the son walks at the speed of 3.5km/h and the farmer at 4.0km/h. how much time will have elapsed when the farmer and his son are 2.5km apart<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Apply the distance formula:<BR>\n" );
document.write( "d = rt<BR>\n" );
document.write( "where<BR>\n" );
document.write( "d is distance<BR>\n" );
document.write( "r is rate or speed<BR>\n" );
document.write( "t is time<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Let t = elapsed time<BR>\n" );
document.write( "then<BR>\n" );
document.write( "3.5t + 4t = 2.5<BR>\n" );
document.write( "7.5t = 2.5<BR>\n" );
document.write( "t = 2.5/7.5<BR>\n" );
document.write( "t = 25/75<BR>\n" );
document.write( "t = 1/3 of an hour (or 20 minutes)<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );