document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=203250>Question 203250</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A car travels 40km per hour between two cities that are 90 km apart.  How fast must the car travel on the return trip to average 50 km per hour for the round-trip? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #153353 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=153353\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A car travels 40km per hour between two cities that are 90 km apart.<BR>\n" );
document.write( " How fast must the car travel on the return trip to average 50 km per hour,<BR>\n" );
document.write( " for the round-trip?<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Let s = speed required on the return trip to average 50 km/h<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Write a time equation Time = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=dist%2Fspeed ALIGN=MIDDLE  ALT=\"dist%2Fspeed\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ":<BR>\n" );
document.write( "outbound time + return time = time at 50 km/hr<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=90%2F40 ALIGN=MIDDLE  ALT=\"90%2F40\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=90%2Fs ALIGN=MIDDLE  ALT=\"90%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=180%2F50 ALIGN=MIDDLE  ALT=\"180%2F50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply by 200s:<BR>\n" );
document.write( "200s*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=90%2F40%29 ALIGN=MIDDLE  ALT=\"90%2F40%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > + 200s*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=90%2Fs ALIGN=MIDDLE  ALT=\"90%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 200s*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=180%2F50 ALIGN=MIDDLE  ALT=\"180%2F50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Cancel out the denominators:<BR>\n" );
document.write( "5s(90) + 200(90) = 4s(180)<BR>\n" );
document.write( ":<BR>\n" );
document.write( "450s + 18000 = 720s<BR>\n" );
document.write( ":<BR>\n" );
document.write( "18000 = 720s - 450s<BR>\n" );
document.write( ":<BR>\n" );
document.write( "18000 = 270s<BR>\n" );
document.write( "s = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=18000%2F270 ALIGN=MIDDLE  ALT=\"18000%2F270\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "s = 66<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%2F3 ALIGN=MIDDLE  ALT=\"2%2F3\"   DISABLED_style= \"max-width:90%; height:auto;\" > km/hr required on the return trip<BR>\n" );
document.write( ":<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Check solution in the time equation<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=90%2F40 ALIGN=MIDDLE  ALT=\"90%2F40\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=90%2F66.67 ALIGN=MIDDLE  ALT=\"90%2F66.67\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=180%2F50 ALIGN=MIDDLE  ALT=\"180%2F50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "2.25 + 1.35 = 3.6<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );