document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=959050>Question 959050</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A train leaves Dallas and travels north at 85 kilometers per hour. Another train leaves at the same time and travels south at 70 kilometers per hour. How long will it take before they are 620 kilometers apart?\r<BR>\n" );
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document.write( "How do I solve this problem? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #586169 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=586169\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You can think of this a one train ( either one )<BR>\n" );
document.write( "moving at the sum of their speeds, and the<BR>\n" );
document.write( "other train standing still<BR>\n" );
document.write( "-------------------------<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 hours when they are<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+620+ ALIGN=MIDDLE  ALT=\"+620+\"   DISABLED_style= \"max-width:90%; height:auto;\" > km apart<BR>\n" );
document.write( "-------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+620+=+%28+85+%2B+70+%29%2At+ ALIGN=MIDDLE  ALT=\"+620+=+%28+85+%2B+70+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+620+=+155t+ ALIGN=MIDDLE  ALT=\"+620+=+155t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<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( "In 4 hrs they will be 620 km apart<BR>\n" );
document.write( "----------------<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "Equation for southbound train:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%5B1%5D+=+70%2A4+ ALIGN=MIDDLE  ALT=\"+d%5B1%5D+=+70%2A4+\"   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+=+280+ ALIGN=MIDDLE  ALT=\"+d%5B1%5D+=+280+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Equation for northbound train:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%5B2%5D+=+85%2A4+ ALIGN=MIDDLE  ALT=\"+d%5B2%5D+=+85%2A4+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%5B2%5D+=+340+ ALIGN=MIDDLE  ALT=\"+d%5B2%5D+=+340+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-----------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%5B1%5D+%2B+d%5B2%5D+=+280+%2B+340+ ALIGN=MIDDLE  ALT=\"+d%5B1%5D+%2B+d%5B2%5D+=+280+%2B+340+\"   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+%2B+d%5B2%5D+=+620+ ALIGN=MIDDLE  ALT=\"+d%5B1%5D+%2B+d%5B2%5D+=+620+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );