document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=879274>Question 879274</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A plane leaves Chicago  flying due east at 225 mph. While a train that left 2 1/4 hours earlier is going  due east at 85 mph. How much  time will it take them to be 750 miles apart? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #530740 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=530740\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> What is the train's head start?<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%5B1%5D+=+85%2A2.25+ ALIGN=MIDDLE  ALT=\"+d%5B1%5D+=+85%2A2.25+\"   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+=+191.25+ ALIGN=MIDDLE  ALT=\"+d%5B1%5D+=+191.25+\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi<BR>\n" );
document.write( "----------------------<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 the plane travels <BR>\n" );
document.write( "when they are <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+750+ ALIGN=MIDDLE  ALT=\"+750+\"   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=+t+ ALIGN=MIDDLE  ALT=\"+t+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the time that the plane travels<BR>\n" );
document.write( "when they are <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+750+ ALIGN=MIDDLE  ALT=\"+750+\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi apart<BR>\n" );
document.write( "--------------------------------<BR>\n" );
document.write( "Plane's equation:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+225t+ ALIGN=MIDDLE  ALT=\"+d+=+225t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Train's equation:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+d+-+191.25+%29+-+750+=+85t+ ALIGN=MIDDLE  ALT=\"+%28+d+-+191.25+%29+-+750+=+85t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-------------------------------<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+-+941.25+=+85t+ ALIGN=MIDDLE  ALT=\"+d+-+941.25+=+85t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Substitute (1) into (2)<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+225t+-+941.25+=+85t+ ALIGN=MIDDLE  ALT=\"+225t+-+941.25+=+85t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+140t+=+941.25+ ALIGN=MIDDLE  ALT=\"+140t+=+941.25+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+6.7232+ ALIGN=MIDDLE  ALT=\"+t+=+6.7232+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "also <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.7232%2A60+=+43+ ALIGN=MIDDLE  ALT=\"+.7232%2A60+=+43+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "It will take them 6 hrs and 43 min<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+225t+ ALIGN=MIDDLE  ALT=\"+d+=+225t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+225%2A6.7232+ ALIGN=MIDDLE  ALT=\"+d+=+225%2A6.7232+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+1512.72+ ALIGN=MIDDLE  ALT=\"+d+=+1512.72+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+d+-+191.25+%29+-+750+=+85t+ ALIGN=MIDDLE  ALT=\"+%28+d+-+191.25+%29+-+750+=+85t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+d+-+191.25+%29+-+750+=+85%2A6.7232+ ALIGN=MIDDLE  ALT=\"+%28+d+-+191.25+%29+-+750+=+85%2A6.7232+\"   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+-+941.25+=+571.472+ ALIGN=MIDDLE  ALT=\"+d+-+941.25+=+571.472+\"   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+=+1512.72+ ALIGN=MIDDLE  ALT=\"+d+=+1512.72+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );