document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=844170>Question 844170</A>: <I><SPAN STYLE=\"word-break: break-all;\"> please help me solve this: <BR>\n" );
document.write( "on a certain trip, edgar drive 231 km in exactly the same time as erwin drive 308 km. If Erwin's rate exceeded that of edgar by 13 kph. Determine the rate of Erwin </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #508590 by </B><A HREF=/tutors/aboutme.mpl?userid=algebrahouse.com><B>algebrahouse.com(1659)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=algebrahouse.com><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=algebrahouse.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=508590\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Distance = rate x time\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "distance<BR>\n" );
document.write( "-------- = time<BR>\n" );
document.write( "rate\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "231<BR>\n" );
document.write( "--- = Edgar's time<BR>\n" );
document.write( "r\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "308<BR>\n" );
document.write( "------ = Erwin's time {Erwin's rate exceeded Edgar's by 13 kph}<BR>\n" );
document.write( "r + 13\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "231/r = 308/(r + 13) {their times were equal}<BR>\n" );
document.write( "231r + 3003 = 308r {cross-multiplied in the proportion}<BR>\n" );
document.write( "3003 = 77r {subtracted 231r from each side}<BR>\n" );
document.write( "r = 39 {divided each side by 77}<BR>\n" );
document.write( "r + 13 = 52 {substituted 39, in for r, into r + 13}\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Erwin's rate was 52 kph<BR>\n" );
document.write( "<br>For more help from me, visit: <a  rel=nofollow HREF= \"http://www.algebrahouse.com/\" target = \"_blank\">www.algebrahouse.com</a><br><br><br> </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );