document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1042715>Question 1042715</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a car travels at a constant speed for 450km if the average speed was increased by 15km/h the journey would have taken 90 min less find speed of car </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #657743 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39620)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=657743\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <i>a car travels at a constant speed for 450km if the average speed was increased by 15km/h the journey would have taken 90 min less find speed of car  </i><BR>\n" );
document.write( "--<BR>\n" );
document.write( "<i>A car travels at a constant speed for r kilometers per hour. If the average speed was increased by k, the journey would have taken h hours. Find speed of car. </i>\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Units will be in kilometers, kilometers per hour, and hours, units.<BR>\n" );
document.write( "Basic Travel Rates Rule to relate RATE, TIME, and DISTANCE, using R, T, and D, is RT=D.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "These variables assignments are made:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28r=450%28kilometers%2Fhour%29%2Ck=25%28kilometers%2Fhour%29%2Ch=90%2Aminutes=%281%261%2F2%29hours%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Solve for k, and  for d.\r<BR>\n" );
document.write( "\n" );
document.write( "<PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\">\r\n" );
document.write( "               RATE        TIME       DISTANCE\r\n" );
document.write( "AS DONE         r           t          d\r\n" );
document.write( "IF FASTER      r+k          t-h        d\r\n" );
document.write( "</PRE>\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%28highlight_green%28system%28rt=d%2C%28r%2Bk%29%28t-h%29=d%29%29%29 ALIGN=MIDDLE  ALT=\"highlight_green%28highlight_green%28system%28rt=d%2C%28r%2Bk%29%28t-h%29=d%29%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Can you solve this system?  It is nonlinear, and allows for two substitutions in the steps.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );