document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=476190>Question 476190</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A bicyclist rides for 2h at a speed of 10 mph and then returns at a speed of 20 mph. find the cyclist average speed for the trip? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #326546 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=326546\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> It's similar to parallel resistors, but times 2<BR>\n" );
document.write( "Avg speed = 2*product/sum = 2*10*20/(10 + 20) = 400/30<BR>\n" );
document.write( "= 13.33 mph<BR>\n" );
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document.write( "Notice the distance is not relevant.<BR>\n" );
document.write( "This was used in the Michelson-Morley experiment to disprove the existence of the ether, in 1840. </SPAN>\n" );
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