document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=919850>Question 919850</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A diesel train left Miami and traveled toward Johannesburg at an average speed of 10 mph. A freight train left 11 hours later and traveled in the opposite direction with an average speed of 60 mph. How long does the freight train need to travel before the trains are 390 mi. apart?\r<BR>\n" );
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document.write( "I know that I am supposed to set up a distance, rate, time chart and fill in the information and then set up and equation, but I am not entirely sure how to set up the equation here, because of the fact that the freight train left 11 hours later.   </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #558023 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=558023\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I use a logical story-line approach<BR>\n" );
document.write( "What is the diesel train's head start in miles?<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%5B1%5D+=+10%2A11+ ALIGN=MIDDLE  ALT=\"+d%5B1%5D+=+10%2A11+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%5B1%5D+=+110+ ALIGN=MIDDLE  ALT=\"+d%5B1%5D+=+110+\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi<BR>\n" );
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document.write( "Start a stopwatch when the freight train leaves Miami<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+ ALIGN=MIDDLE  ALT=\"+t+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = time in hrs on the stop watch when<BR>\n" );
document.write( "the trains are <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+390+ ALIGN=MIDDLE  ALT=\"+390+\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi apart<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+ ALIGN=MIDDLE  ALT=\"+d+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the distance in miles that the<BR>\n" );
document.write( "freight train travels until they are <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+390+ ALIGN=MIDDLE  ALT=\"+390+\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi apart<BR>\n" );
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document.write( "Diesel's equation:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+390+-+110+-+d+=+10t+ ALIGN=MIDDLE  ALT=\"+390+-+110+-+d+=+10t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Freight train's equation:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+60t+ ALIGN=MIDDLE  ALT=\"+d+=+60t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "Substitute (2) into (1)<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+390+-+110+-+60t+=+10t+ ALIGN=MIDDLE  ALT=\"+390+-+110+-+60t+=+10t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+280+-+60t+=+10t+ ALIGN=MIDDLE  ALT=\"+280+-+60t+=+10t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+70t+=+280+ ALIGN=MIDDLE  ALT=\"+70t+=+280+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+4+ ALIGN=MIDDLE  ALT=\"+t+=+4+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "---------------<BR>\n" );
document.write( "The freight train travels for 4 hrs until they are 390 mi apart<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+60%2A4+ ALIGN=MIDDLE  ALT=\"+d+=+60%2A4+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+240+ ALIGN=MIDDLE  ALT=\"+d+=+240+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+390+-+110+-+d+=+10t+ ALIGN=MIDDLE  ALT=\"+390+-+110+-+d+=+10t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+390+-+110+-+240+=+10%2A4+ ALIGN=MIDDLE  ALT=\"+390+-+110+-+240+=+10%2A4+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+40+=+40+ ALIGN=MIDDLE  ALT=\"+40+=+40+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK\r<BR>\n" );
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