document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=490243>Question 490243</A>: <I><SPAN STYLE=\"word-break: break-all;\"> wo trains are 2 kms apart. Speed of one train is 20m/s and the other train is running at 30 m/s .Lengths of the trains are 200 and 300m. In how much time do the trains cross eac      Log On<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #333956 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=333956\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I take it to mean \"How long will it be until the trains<BR>\n" );
document.write( "have crossed each other?\"<BR>\n" );
document.write( "I assume they are headed in the same direction<BR>\n" );
document.write( "I want to know how long it takes for the head of the<BR>\n" );
document.write( "train that is behind to reach the tail of the train<BR>\n" );
document.write( "that is ahead. <BR>\n" );
document.write( "I'll say the one ahead is the 20 m/sec train<BR>\n" );
document.write( "If the slower train is behind, it will never catch up!<BR>\n" );
document.write( "The distance the train behind has to go is:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2000+-+200++=+1800+ ALIGN=MIDDLE  ALT=\"+2000+-+200++=+1800+\"   DISABLED_style= \"max-width:90%; height:auto;\" > m<BR>\n" );
document.write( "The speed of the train behind is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+30+ ALIGN=MIDDLE  ALT=\"+30+\"   DISABLED_style= \"max-width:90%; height:auto;\" > m/sec<BR>\n" );
document.write( "From that you have to subtract the other train's<BR>\n" );
document.write( "speed. <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1800+=+%2830+-+20%29%2At+ ALIGN=MIDDLE  ALT=\"+1800+=+%2830+-+20%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=+t+=+1800%2F10+ ALIGN=MIDDLE  ALT=\"+t+=+1800%2F10+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+180+ ALIGN=MIDDLE  ALT=\"+t+=+180+\"   DISABLED_style= \"max-width:90%; height:auto;\" > sec<BR>\n" );
document.write( "Now how long does it take the tail of the train behind<BR>\n" );
document.write( "to reach the head of the train ahead?<BR>\n" );
document.write( "You can think of the train ahead as standing still and<BR>\n" );
document.write( "the train behind traveling at the difference of their speeds<BR>\n" );
document.write( "The train behind has to travel <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+300+%2B+200+=+500+ ALIGN=MIDDLE  ALT=\"+300+%2B+200+=+500+\"   DISABLED_style= \"max-width:90%; height:auto;\" > for it's<BR>\n" );
document.write( "tail to reach the head of the other<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+500+=+10%2At+ ALIGN=MIDDLE  ALT=\"+500+=+10%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+50+ ALIGN=MIDDLE  ALT=\"+t+=+50+\"   DISABLED_style= \"max-width:90%; height:auto;\" > sec<BR>\n" );
document.write( "The total time is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+180+%2B+50+=+230+ ALIGN=MIDDLE  ALT=\"+180+%2B+50+=+230+\"   DISABLED_style= \"max-width:90%; height:auto;\" > sec<BR>\n" );
document.write( "for the trains to pass each other.<BR>\n" );
document.write( "Hope I got it.\r<BR>\n" );
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