document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=532865>Question 532865</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Rodney Racer averages 90mph in the first lap of a race. How fast must he go in the second half in order to average 120mph for the whole race? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #350925 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=350925\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Rodney Racer averages 90mph in the first lap of a race.<BR>\n" );
document.write( " How fast must he go in the second half in order to average 120mph for the whole race?<BR>\n" );
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document.write( "Let s = speed required to average 120 mph<BR>\n" );
document.write( "d = one lap distance<BR>\n" );
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document.write( "Write a time equation; time = dist/speed<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F90 ALIGN=MIDDLE  ALT=\"d%2F90\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2Fs ALIGN=MIDDLE  ALT=\"d%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%282d%29%2F120 ALIGN=MIDDLE  ALT=\"%282d%29%2F120\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "reduce the third fraction<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F90 ALIGN=MIDDLE  ALT=\"d%2F90\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2Fs ALIGN=MIDDLE  ALT=\"d%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F60 ALIGN=MIDDLE  ALT=\"d%2F60\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply by 180s to get rid of the denominators, results<BR>\n" );
document.write( "2ds + 180d = 3ds<BR>\n" );
document.write( "simplify, divide by d<BR>\n" );
document.write( "2s + 180 = 3s<BR>\n" );
document.write( "180 = 3s - 2s<BR>\n" );
document.write( "180 = s<BR>\n" );
document.write( "He has to run 180 mph to average 120 for the two laps </SPAN>\n" );
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