document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=811533>Question 811533</A>: <I><SPAN STYLE=\"word-break: break-all;\"> if ben drives on a highway 80 miles 30 mi/hr. then back on the same highway, but 40 mi/hr. what is his average rate </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #488777 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=488777\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> if ben drives on a highway 80 miles 30 mi/hr. then back on the same highway, but 40 mi/hr. what is his average rate<BR>\n" );
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document.write( "RT time = 80/30 + 80/40 hours<BR>\n" );
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document.write( "Avg rate = 160/(RT time)<BR>\n" );
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document.write( "If you work that out, you'll find that<BR>\n" );
document.write( "avg rate = 2*30*40/(30 + 40)<BR>\n" );
document.write( "= 240/7 mi/hr<BR>\n" );
document.write( "=~ 34.71 mi/hr<BR>\n" );
document.write( "This is true regardless of the distance.<BR>\n" );
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