document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=187402>Question 187402</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A freight train covered 120 miles at a certain speed. Had the train been able to travel 10 mph faster, the trip would have been 2 hours shorter. How fast did the train go?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #140495 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=140495\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> D=RT<BR>\n" );
document.write( "D/R=T<BR>\n" );
document.write( "120/X=T<BR>\n" );
document.write( "120/(X+10)=T-2<BR>\n" );
document.write( "NOW REPLACE T WITH 120/X IN THE SECOND EQUATION & SOLVE FOR X.<BR>\n" );
document.write( "120/(X+10)=(120/X)-2 <BR>\n" );
document.write( "120/(X+10)=(120-2X)/X NOW CROSS MULTIPLY.<BR>\n" );
document.write( "(X+10)(120-2X)=120X<BR>\n" );
document.write( "120X+1200-20X-2X^2=120X<BR>\n" );
document.write( "-2X^2+100X+1200-120X=0<BR>\n" );
document.write( "-2X^2-20X+1200=0<BR>\n" );
document.write( "-2(X^2+10X-600)=0<BR>\n" );
document.write( "-2(X-20)(X+30)=0<BR>\n" );
document.write( "X-20=0<BR>\n" );
document.write( "X=20 MPH. ANS. FOR THE FIRST 120 MILE TRIP.<BR>\n" );
document.write( "20+10=30 MPH. ANS. FOR THE FASTER TRIP.<BR>\n" );
document.write( "PROOF:<BR>\n" );
document.write( "120/30=(120/20)-2<BR>\n" );
document.write( "4=6-2<BR>\n" );
document.write( "4=4 <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );