document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=841942>Question 841942</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Starting at home, Christopher traveled uphill to the grocery store for 30 minutes at just 4 mph. He then traveled back home along the same path downhill at a speed of 12 mph.\r<BR>\n" );
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document.write( "What is his average speed for the entire trip from home to the grocery store and back? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #507283 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=507283\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Starting at home, Christopher traveled uphill to the grocery store for 30 minutes at just 4 mph. He then traveled back home along the same path downhill at a speed of 12 mph.<BR>\n" );
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document.write( "Avg speed for a round trip, or a trip of 2 equal legs is:<BR>\n" );
document.write( "avg = 2*4*12/(4+12) = 96/16<BR>\n" );
document.write( "= 6 mi/hr<BR>\n" );
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