document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=813170>Question 813170</A>: <I><SPAN STYLE=\"word-break: break-all;\"> you bicycle 15 miles at 21 mph, then 20 miles at 18 mph, and finally 30 miles at 12. how do i find the average speed? do i just add each of the speeds and divide by 3? or is there something else i need to do with the miles? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #489513 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=489513\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Average speed is always ( total distance traveled ) / ( total time spent traveling )<BR>\n" );
document.write( "It is not an average of several average speeds<BR>\n" );
document.write( "-----------------<BR>\n" );
document.write( "1st part of trip:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+15+=+21t+ ALIGN=MIDDLE  ALT=\"+15+=+21t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+15%2F21+ ALIGN=MIDDLE  ALT=\"+t+=+15%2F21+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "2nd part:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+20+=+18t+ ALIGN=MIDDLE  ALT=\"+20+=+18t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+20%2F18+ ALIGN=MIDDLE  ALT=\"+t+=+20%2F18+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "3rd part:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+30+=+12t+ ALIGN=MIDDLE  ALT=\"+30+=+12t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+30%2F12+ ALIGN=MIDDLE  ALT=\"+t+=+30%2F12+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "--------------<BR>\n" );
document.write( "The total distance traveled is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+15+%2B+20+%2B+30+=+65+ ALIGN=MIDDLE  ALT=\"+15+%2B+20+%2B+30+=+65+\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi<BR>\n" );
document.write( "The total time is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+5%2F7+%2B+10%2F9++%2B+5%2F2+ ALIGN=MIDDLE  ALT=\"+5%2F7+%2B+10%2F9++%2B+5%2F2+\"   DISABLED_style= \"max-width:90%; height:auto;\" > hrs<BR>\n" );
document.write( "You can find the common denominator, or just<BR>\n" );
document.write( "use decimal equivilants<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.71429+%2B+1.111+%2B+2.5+ ALIGN=MIDDLE  ALT=\"+.71429+%2B+1.111+%2B+2.5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+4.3254+ ALIGN=MIDDLE  ALT=\"+t+=+4.3254+\"   DISABLED_style= \"max-width:90%; height:auto;\" > hrs<BR>\n" );
document.write( "------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%2Ft+=+65%2F4.3254+ ALIGN=MIDDLE  ALT=\"+d%2Ft+=+65%2F4.3254+\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi/hr<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%2Ft+=+15.0275+ ALIGN=MIDDLE  ALT=\"+d%2Ft+=+15.0275+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The average speed is 15.0275 mi/hr<BR>\n" );
document.write( "-------------------------------<BR>\n" );
document.write( "You can check this\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );