document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=679044>Question 679044</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Lucky while driving to school computes the average speed for his trip to be 20km/h on his return trip along the same route there is traffic and the average speed is 40km/h what is this average speed? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #421759 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=421759\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Lucky while driving to school computes the average speed for his trip to be 20km/h on his return trip along the same route there is traffic and the average speed is 40km/h what is this average speed?<BR>\n" );
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document.write( "To school DATA:<BR>\n" );
document.write( "rate = 20 kph ; distance = x km ; time = x/20 hrs<BR>\n" );
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document.write( "From school DATA:<BR>\n" );
document.write( "rate = 40 kph ; distance = x km ; time = x/40 hrs<BR>\n" );
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document.write( "Average speed = total distance/total time = 2x/(x/20+x/40) = 2x/(60x/800)<BR>\n" );
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document.write( "= 1600/60 = 160/6 = 26 2/3 km/hr<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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