document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=490838>Question 490838</A>: <I><SPAN STYLE=\"word-break: break-all;\"> in order to qualify for finals in racing event,a race car must achieve an average speed of 250km/hr on a track with a total length of 1600m.if a particular car covers the first half of the track at an average speed of 230km/hr,what minimum average speed must it have in the second half of the track in order to qualify </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #334382 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=334382\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> in order to qualify for finals in racing event, a race car must achieve an average speed of 250km/hr on a track with a total length of 1600m.<BR>\n" );
document.write( "if a particular car covers the first half of the track at an average speed of 230km/hr, what minimum average speed must it have in the second half of the track in order to qualify<BR>\n" );
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document.write( "Let s = min average speed for the 2nd half of the track<BR>\n" );
document.write( "Change the distances to .8 km and 1.6 km<BR>\n" );
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=.8%2F230 ALIGN=MIDDLE  ALT=\".8%2F230\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=.8%2Fs ALIGN=MIDDLE  ALT=\".8%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1.6%2F250 ALIGN=MIDDLE  ALT=\"1.6%2F250\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "multiply by 57500s (230*250) to clear the denominators, results:<BR>\n" );
document.write( "250s(.8) + 57500(.8) = 230s(1.6)<BR>\n" );
document.write( "200s + 46000 = 368s<BR>\n" );
document.write( "46000 = 368s - 200s<BR>\n" );
document.write( "46000 = 168s<BR>\n" );
document.write( "s = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=46000%2F168 ALIGN=MIDDLE  ALT=\"46000%2F168\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "s = 273.8 km/hr to average 250 km.hr<BR>\n" );
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document.write( "You can confirm this by finding the actual times<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=.8%2F230 ALIGN=MIDDLE  ALT=\".8%2F230\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=.8%2F273.8 ALIGN=MIDDLE  ALT=\".8%2F273.8\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1.6%2F250 ALIGN=MIDDLE  ALT=\"1.6%2F250\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( " </SPAN>\n" );
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