document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=94354>Question 94354</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I can get the anser to this but I dont know how they got it.v and r are riding their bikes.V rides at 10 miles per hour while R rides at 7.r has a 30 minute head start. How long has R been riding when V is 7 miles ahead of him?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #68716 by </B><A HREF=/tutors/aboutme.mpl?userid=edjones><B>edjones(8007)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=edjones><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=edjones><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=68716\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> d=ts <BR>\n" );
document.write( "distance=time*speed<BR>\n" );
document.write( "for R t=t  s=7 d=7t<BR>\n" );
document.write( "for V t=t-.5 d=d+7 s=10<BR>\n" );
document.write( "R's distance=V's distance-7<BR>\n" );
document.write( "7t=10(t-.5)-7<BR>\n" );
document.write( "7t=10t-5-7<BR>\n" );
document.write( "7t=10t-12 Then subtract 10t from each side<BR>\n" );
document.write( "-3t=-12 then divide both sides by -3<BR>\n" );
document.write( "t=4hrs Time R has been riding when V is 7 mi ahead of him<BR>\n" );
document.write( "Check: 4*7=28mi=distance of R<BR>\n" );
document.write( "====3.5*10=35mi=distance of V<BR>\n" );
document.write( "EdJones </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );