document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=166104>Question 166104</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If I drive 80km at 20kmph and then 60km at 30 kmph how fast must I drive the remaining 40 km, in kilometers per hour, to average 22.5 kmph for the entire trip? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #122468 by </B><A HREF=/tutors/aboutme.mpl?userid=Mathtut><B>Mathtut(3670)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Mathtut><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=122468\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> total AVERAGE rate of speed for entire trip we will call r=22.5\r<BR>\n" );
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document.write( "r1=20---1st 80mi<BR>\n" );
document.write( "r2=30---next 60mi<BR>\n" );
document.write( "r3=unknown(this is what we are trying to find--- of final 40mi\r<BR>\n" );
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document.write( "(r1+r2+r3)/3=r\r<BR>\n" );
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document.write( "20+30+r3=3(22.5)<BR>\n" );
document.write( "r3=67.5-50<BR>\n" );
document.write( "r3=17.5kmph<BR>\n" );
document.write( " </SPAN>\n" );
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