document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=875111>Question 875111</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Say I ride my bike 30 miles at an average speed of 17 mph. If I ride at an average speed of 14 mph for the first 15 miles how can I calculate the average speed for the final 15 miles?   </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #528026 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=528026\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Say I ride my bike 30 miles at an average speed of 17 mph.<BR>\n" );
document.write( " If I ride at an average speed of 14 mph for the first 15 miles,<BR>\n" );
document.write( " how can I calculate the average speed for the final 15 miles? <BR>\n" );
document.write( ":<BR>\n" );
document.write( "Write a time equation, Let s = speed required for the final 15 mi<BR>\n" );
document.write( "Time = dist/speed<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=15%2F14 ALIGN=MIDDLE  ALT=\"15%2F14\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=15%2Fs ALIGN=MIDDLE  ALT=\"15%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=30%2F17 ALIGN=MIDDLE  ALT=\"30%2F17\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "multiply equation by 14*17*s = 238s<BR>\n" );
document.write( "238s*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=15%2F14 ALIGN=MIDDLE  ALT=\"15%2F14\"   DISABLED_style= \"max-width:90%; height:auto;\" > + 238s<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=15%2Fs ALIGN=MIDDLE  ALT=\"15%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 238s<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=30%2F17 ALIGN=MIDDLE  ALT=\"30%2F17\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "cancel the denominators<BR>\n" );
document.write( "17s(15) + 238(15) = 14s(30)<BR>\n" );
document.write( "255s + 3570 = 420s<BR>\n" );
document.write( "3570 = 420s - 255s<BR>\n" );
document.write( "3570 = 165s<BR>\n" );
document.write( "s = 3570/165<BR>\n" );
document.write( "s = 21.6 mph hr required on the last 15 mi<BR>\n" );
document.write( ":<BR>\n" );
document.write( ":<BR>\n" );
document.write( "See if that checks out, find the times<BR>\n" );
document.write( "15/14 + 15/21.6 = 30/17<BR>\n" );
document.write( "1.07 + .69 = 1.76 <BR>\n" );
document.write( " </SPAN>\n" );
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