document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=890036>Question 890036</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If Charlene biked up a hill at a speed of 12 miles per hour and came down the hill using the same route and averaged of 15 miles per hour for her round trip, then what was her rate (in miles per hour) coming down the hill?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #538644 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=538644\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If Charlene biked up a hill at a speed of 12 miles per hour and came down the hill using the same route and averaged of 15 miles per hour for her round trip, then what was her rate (in miles per hour) coming down the hill? <BR>\n" );
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document.write( "Avg speed of a round trip:<BR>\n" );
document.write( "Avg = 2*r1*r2/(r1 + r2)<BR>\n" );
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document.write( "15 = 2*12*r2/(12 + r2)<BR>\n" );
document.write( "180 + 15r2 = 24r2<BR>\n" );
document.write( "180 = 9r2<BR>\n" );
document.write( "r2 = 20 mi/hr<BR>\n" );
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