document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=566220>Question 566220</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Maria drove to a business appointment at 50mph in the morning.  Her average speed on the return trip in the afternoon was 40 mph. The return trip took 1/4hr longer because of traffic. How far did she travel to the appointment? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #366165 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=366165\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Maria drove to a business appointment at 50mph in the morning.  Her average speed on the return trip in the afternoon was 40 mph. The return trip took 1/4hr longer because of traffic. How far did she travel to the appointment?<BR>\n" );
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document.write( "d = r*t<BR>\n" );
document.write( "d = 50t = 40*(t + 0.25)<BR>\n" );
document.write( "50t = 40t + 10<BR>\n" );
document.write( "t = 1 hour<BR>\n" );
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document.write( "d = 50*1 = 50 miles<BR>\n" );
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document.write( "Notice that the avg speed for the round trip is not the average of 50 and 40.<BR>\n" );
document.write( "Why is that?<BR>\n" );
document.write( "The avg speed is less, = 44.444... mi/hr, not 45 </SPAN>\n" );
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