document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=469609>Question 469609</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Kam traveled 240 miles east of St. Louis. For most of the trip he averaged 70mph, but for one period of time he slowed to 20 mph due to heavy traffic. If the total time of travel was 7 hours, how many miles did he travel at the reduced speed? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #322215 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=322215\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Kam traveled 240 miles east of St. Louis. For most of the trip he averaged 70mph,<BR>\n" );
document.write( " but for one period of time he slowed to 20 mph due to heavy traffic.<BR>\n" );
document.write( " If the total time of travel was 7 hours, how many miles did he travel at the reduced speed?<BR>\n" );
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document.write( "Let r = total miles at reduced speed<BR>\n" );
document.write( "then<BR>\n" );
document.write( "(240-r) = total miles at 70 mph<BR>\n" );
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document.write( "Write a time equation, time = dist/speed<BR>\n" );
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document.write( "Fast time + slow time = 7 hrs<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28240-r%29%2F70 ALIGN=MIDDLE  ALT=\"%28240-r%29%2F70\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%2F20 ALIGN=MIDDLE  ALT=\"r%2F20\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 7<BR>\n" );
document.write( "Multiply by 140 to clear the denominators, results:<BR>\n" );
document.write( "2(240-r) + 7r = 140(7)<BR>\n" );
document.write( "480 - 2r + 7r = 980<BR>\n" );
document.write( "-2r + 7r = 980 - 480<BR>\n" );
document.write( "5r = 500<BR>\n" );
document.write( "r = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=500%2F5 ALIGN=MIDDLE  ALT=\"500%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "r = 100 mi at 20 mph<BR>\n" );
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document.write( "See if that adds up, find the times:<BR>\n" );
document.write( "(240-100)/70 = 2 hrs<BR>\n" );
document.write( "100/20 =  5 hrs<BR>\n" );
document.write( "------------------<BR>\n" );
document.write( "total time = 7 hrs </SPAN>\n" );
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