document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=573120>Question 573120</A>: <I><SPAN STYLE=\"word-break: break-all;\"> there's an army 5 miles long marching at 3 mph your in front and you have to take a letter 5 miles to back of the line at 5 mph and return to the front at 5 mph how many miles and how many hours did it take </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #368675 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=368675\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> there's an army 5 miles long marching at 3 mph your [sic] in front and you have to take a letter 5 miles to back of the line at 5 mph and return to the front at 5 mph how many miles and how many hours did it take<BR>\n" );
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document.write( "The round trip distance is 10 miles.<BR>\n" );
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document.write( "The relative speed going is 3 + 5 = 8 mi/hr<BR>\n" );
document.write( "Returning it's 5 - 3 = 2 mi/hr<BR>\n" );
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document.write( "The avg speed for the round trip is<BR>\n" );
document.write( "2*8*2/(8 + 2) = 3.2 mi/hr<BR>\n" );
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document.write( "t = d/r = 10/3.2 = 3.125 hours<BR>\n" );
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