document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=394139>Question 394139</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the speed of the train if an increase of 6kph lowers the time for a journey of 72km by 10 minutes. (Show Your Solution) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #279650 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=279650\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find the speed of the train if an increase of 6kph lowers the time for a journey of 72km by 10 minutes. (Show Your Solution)<BR>\n" );
document.write( "..<BR>\n" );
document.write( "let speed =x mph<BR>\n" );
document.write( "increase speed = x+12<BR>\n" );
document.write( "..<BR>\n" );
document.write( "time = d/r<BR>\n" );
document.write( "original time - increased speed time = 1/6 hours<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=72%2Fx-%2872%2F%28x%2B12%29%29=+1%2F6 ALIGN=MIDDLE  ALT=\"72%2Fx-%2872%2F%28x%2B12%29%29=+1%2F6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "..<BR>\n" );
document.write( "LCD = x(x+12)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2872%28x%2B12%29-72x%29%2Fx%28x%2B12%29=+1%2F6%0D%0A..%0D%0A%7B%7B%7B%2872x%2B864-72x%29%2Fx%28x%2B12%29=+1%2F6 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=864=+%28x%28x%2B12%29%29%2F6 ALIGN=MIDDLE  ALT=\"864=+%28x%28x%2B12%29%29%2F6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "6*864=x^2+12x<BR>\n" );
document.write( "5184=x^2+12<BR>\n" );
document.write( "x^2+12x-5184 =0<BR>\n" );
document.write( "solve using quadratic formula<BR>\n" );
document.write( "a=1, b= 12,c=-5184<BR>\n" );
document.write( "b^2-4ac=20880<BR>\n" );
document.write( "you will  get the speed = 66.24 kph<BR>\n" );
document.write( "...<BR>\n" );
document.write( "m.ananth@hotmail.ca<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );