document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1157>Question 1157</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Two trains, one 500 meters long and the other 1000 meters long, are traveling in opposite directions on parallel tracks.  The first train is traveling at 100km/h and the other at 80km/h.  How long will it take for the trains to pass each other from the moment the locomotives are at the same point?\r<BR>\n" );
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document.write( " The diagram as below.\r<BR>\n" );
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document.write( "   500 m 100 km/h -><BR>\n" );
document.write( "   A<------>B (1st train)<BR>\n" );
document.write( "          C<------------->D (2nd train)<BR>\n" );
document.write( "            <- 80 km/h 1000 m <BR>\n" );
document.write( " When they pass each other after t hrs,diagram as<BR>\n" );
document.write( "                 A      B<BR>\n" );
document.write( "                 <------><BR>\n" );
document.write( "   <-------------><BR>\n" );
document.write( "   C             D<BR>\n" );
document.write( " After t hrs, B moves 100 t km and C moves 80 t km.<BR>\n" );
document.write( " So we have 100 t + 80 t = BC = CD + AB = 1000+ 500<BR>\n" );
document.write( " So, 180 t = 1500, t  = 25/3 hrs <BR>\n" );
document.write( " [Or get t by (1000+ 500)/(100+80) directly.<BR>\n" );
document.write( " Answer: it takes 25/3 hrs for the trains to pass each other <BR>\n" );
document.write( "from the moment the locomotives are at the same point.<BR>\n" );
document.write( " Or get t by (1000 + 500)/ (1000+ 60) directly. </SPAN>\n" );
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