document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=894874>Question 894874</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A car traveling at 80 kilometers per hour is passed by a second car going in the same direction at a constant speed. After 30 seconds, the two cars are 500 meters apart. Find the speed of the second car. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #542468 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=542468\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "change 500 meters to kilometers <BR>\n" );
document.write( "500 meters is 1/2 k<BR>\n" );
document.write( "(80+r)*(30/3600)-(80*30/3600)=1/2\r<BR>\n" );
document.write( "\n" );
document.write( "30r/3600=1/2\r<BR>\n" );
document.write( "\n" );
document.write( "r/120=1/2<BR>\n" );
document.write( "r=60<BR>\n" );
document.write( "so the second car was going 80+60=140 kph<BR>\n" );
document.write( "check<BR>\n" );
document.write( "(140)*(30/3600)-(80*30/3600)=1/2\r<BR>\n" );
document.write( "\n" );
document.write( "7/6-4/6=3/6<BR>\n" );
document.write( "3/6=1/2 km<BR>\n" );
document.write( "ok\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "The other tutor didn't read the question correctly.\r<BR>\n" );
document.write( "\n" );
document.write( "The key is that the problem states that the second car passes the first car.<BR>\n" );
document.write( "A car going 20 kph will NOT pass a car going 80 kph\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );