document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=961041>Question 961041</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Starting at home, Christopher traveled uphill to the grocery store for 90 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 #587351 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=587351\">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 90 minutes at just 4 mph. He then traveled back home along the same path downhill at a speed of 12 mph. <BR>\n" );
document.write( "What is his average speed for the entire trip from home to the grocery store and back?<BR>\n" );
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document.write( "90 min=90/60=1.5 hr<BR>\n" );
document.write( "distance from home to the grocery store=travel time*speed=(1.5)*4=6 mi<BR>\n" );
document.write( "travel time from grocery store to home=distance/speed=6/12=1/2 hr<BR>\n" );
document.write( "average speed=total distance/total travel time=12/2=6 mph </SPAN>\n" );
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