document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=980173>Question 980173</A>: <I><SPAN STYLE=\"word-break: break-all;\"> There was a question about an army travelling 5 mph and a messenger on horseback travelling  at 10 mph(question asks for the distance from front to rear) that was answered by ankor@dixie.net that I didn't really understand why did he add and subtract 5 to the 10 mph rate. I know that you do add +-r or a given amount in wind and water current problems. Is that why you added and subtracted the 5? Some logic of why is all I need, so that I can understand a problem that I've never seen before in any other place than the Schaum College Algebra textbook. Please help. QUESTION: WHY WAS THE 5 ADDED AND SUBTRACTED FROM 10 TO GET 15 AND 5(Denominators) AND WHY 5 AND NOT R? Anybody that understands fully why and can explain is welcome. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #601379 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39618)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=601379\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Add or Subtract depends which way or direction the student uses as positive or negative.  Travel rate is a vector; speed is just the size of the vector quantity.  The group is going in a direct, and the messenger, starting from the front of the group, brings a traveling message IN THE OPPOSITE DIRECTION than the group is traveling.  Accordingly, the signs of the group and of the messenger are opposite. </SPAN>\n" );
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