document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=363355>Question 363355</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Danielle drives from her home to the store at an average speed of 40 miles per hour. She returns home along the same route at an average speed of 60 miles per hour. What is her average speed, in miles per hour, for her 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 #259065 by </B><A HREF=/tutors/aboutme.mpl?userid=amoresroy><B>amoresroy(361)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=amoresroy><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=amoresroy><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=259065\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  Let S = Speed<BR>\n" );
document.write( "     T = travel time<BR>\n" );
document.write( "     D = distance traveled\r<BR>\n" );
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document.write( "Given:<BR>\n" );
document.write( "     S1 = 40<BR>\n" );
document.write( "     S2 = 60 \r<BR>\n" );
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document.write( "Ave S = Total distance traveled divided by total travel time<BR>\n" );
document.write( "      = 2D / ( T1 + T2)<BR>\n" );
document.write( "      = 2D / (D/40 + D/60)<BR>\n" );
document.write( "      = 120 * 2D / [120*(D/40) + 120*(D/60)]<BR>\n" );
document.write( "      = 240 D / (3D + 2D)<BR>\n" );
document.write( "      = 240/5<BR>\n" );
document.write( "      = 48 miles per hour </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );