document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1185644>Question 1185644</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hi<BR>\n" );
document.write( "Becky walks to the stadium which is 580m way from her house for 20min . She walks back to her house using the same route at a speed of 20m per minute. <BR>\n" );
document.write( "What is her average speed. \r<BR>\n" );
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document.write( "Thanks  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #816488 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=816488\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Becky walks to the stadium which is 580m way from her house for 20min . She walks back to her house using the same route at a speed of 20m per minute. <BR>\n" );
document.write( "What is her average speed. <BR>\n" );
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document.write( "Avg speed going is 580/20 = 29 m/min<BR>\n" );
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document.write( "Avg speed for round trip = 2*29*20/(29+20) =~ 23.67 m/minute<BR>\n" );
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document.write( "I don't recommend memorizing formulas generally, but the avg speed for a round trip is 2*v1*v2/(v1+v2).<BR>\n" );
document.write( "This is the same as for parallel flows, parallel resistors, parallel work, etc. except for the factor of 2. </SPAN>\n" );
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