document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=241775>Question 241775</A>: <I><SPAN STYLE=\"word-break: break-all;\">    A car traveled from A to B at an average speed of 40 miles per hour and then immediately traveled back from B to A at an average speed of 60 miles per hour.  What was the car’s average speed for the round-trip, in miles per hour? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #177802 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=177802\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A car traveled from A to B at an average speed of 40 miles per hour and then immediately traveled back from B to A at an average speed of 60 miles per hour. What was the car’s average speed for the round-trip, in miles per hour?<BR>\n" );
document.write( "----------<BR>\n" );
document.write( "d = 40t1<BR>\n" );
document.write( "t1 = d/40<BR>\n" );
document.write( "----------<BR>\n" );
document.write( "d = 60t2<BR>\n" );
document.write( "t2 = d/60<BR>\n" );
document.write( "Avg = 2d/(t1 + t2)<BR>\n" );
document.write( "Avg = 2d/(d/40 + d/60)<BR>\n" );
document.write( "Avg = 2/(1/40 + 1/60) = 2/(25/600) = 1200/25<BR>\n" );
document.write( "Avg = 48 mph<BR>\n" );
document.write( "------------- </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );