document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=269831>Question 269831</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A freight train and an express train leave towns 390km apart, traveling toward one another. The freight train travels 30km per hr slower than the express train. They pass one another 3 hr later. What are their speeds?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #197684 by </B><A HREF=/tutors/aboutme.mpl?userid=drk><B>drk(1908)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=drk><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=197684\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> This is an RTD problem. Here is a table based on the given information<BR>\n" );
document.write( "trains . . . . . . . . .rate . . . . . . . . .time . . . . . . . . .distance<BR>\n" );
document.write( "freight. . . . . . . . r - 30 . . . . . . . . .3 . . . . . . . . . . 3r - 90<BR>\n" );
document.write( "express. . . . . . . .r . . . . . . . . . . .  . 3 . . . . . . . . . . . 3r<BR>\n" );
document.write( "totals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .390<BR>\n" );
document.write( "Look at the last column, we get<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3r+-+90+%2B+3r+=+390 ALIGN=MIDDLE  ALT=\"3r+-+90+%2B+3r+=+390\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "simplify to get<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=6r+-+90+=+380 ALIGN=MIDDLE  ALT=\"6r+-+90+=+380\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "add 90 to get<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=6r+=+480 ALIGN=MIDDLE  ALT=\"6r+=+480\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "divide to get<BR>\n" );
document.write( "express: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r+=+80 ALIGN=MIDDLE  ALT=\"r+=+80\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "freight: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r-30+=+50 ALIGN=MIDDLE  ALT=\"r-30+=+50\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );