document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1003336>Question 1003336</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Ivan drives to the metro station each morning and just to catch his train. He drives at an average speed of 30 miles per hour. Unfortunately this morning, there was a lot of traffic. At the halfway point Ivan found that he had averaged only 15 miles per hour. How fast must Ivan drive for the rest of the way to catch his train? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #620078 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=620078\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  Ivan drives to the metro station each morning and just to catch his train.<BR>\n" );
document.write( " He drives at an average speed of 30 miles per hour.<BR>\n" );
document.write( " Unfortunately this morning, there was a lot of traffic.<BR>\n" );
document.write( " At the halfway point Ivan found that he had averaged only 15 miles per hour.<BR>\n" );
document.write( " How fast must Ivan drive for the rest of the way to catch his train?<BR>\n" );
document.write( ":<BR>\n" );
document.write( "2d = the distance to the station<BR>\n" );
document.write( "then<BR>\n" );
document.write( "2d/30 = the normal time for the trip<BR>\n" );
document.write( "let s = the speed required for the last half of the trip<BR>\n" );
document.write( "Write a time equation<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F15 ALIGN=MIDDLE  ALT=\"d%2F15\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2Fs ALIGN=MIDDLE  ALT=\"d%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%282d%29%2F30 ALIGN=MIDDLE  ALT=\"%282d%29%2F30\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "reduce the 3rd fraction<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F15 ALIGN=MIDDLE  ALT=\"d%2F15\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2Fs ALIGN=MIDDLE  ALT=\"d%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F15 ALIGN=MIDDLE  ALT=\"d%2F15\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "It's obvious from this equation that it's impossible for him to catch his train<BR>\n" );
document.write( "  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );