document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1124756>Question 1124756</A>: <I><SPAN STYLE=\"word-break: break-all;\"> HOW TO DERIVE THIS PROBLEM:<BR>\n" );
document.write( "when the particles moves the first half of a distance at a speed of v1 and second half of the distance at speed v2 then\r<BR>\n" );
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document.write( "                          Vav= 2v1+2v2/v1+v2<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #741119 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=741119\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> HOW TO DERIVE THIS PROBLEM:<BR>\n" );
document.write( "when the particles moves the first half of a distance at a speed of v1 and second half of the distance at speed v2 then\r<BR>\n" );
document.write( "\n" );
document.write( " Vav= 2v1+2v2/v1+v2<BR>\n" );
document.write( "====================<BR>\n" );
document.write( "Not clear.<BR>\n" );
document.write( "Avg speed of a round trip, or of 2 equal lengths is:<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2v%5B1%5D%2Av%5B2%5D%2F%28v%5B1%5D%2Bv%5B2%5D%29 ALIGN=MIDDLE  ALT=\"2v%5B1%5D%2Av%5B2%5D%2F%28v%5B1%5D%2Bv%5B2%5D%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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