document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=712312>Question 712312</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If you must average 60 km/h for a 90-km trip, and you only average 40 km/h for the first 40 km, what velocity must you average the rest of the way?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #437976 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=437976\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If you must average 60 km/h for a 90-km trip, and you only average 40 km/h for the first 40 km, what velocity must you average the rest of the way?<BR>\n" );
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document.write( "Find the time required for the trip:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=90%2F60 ALIGN=MIDDLE  ALT=\"90%2F60\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 1.5 hrs<BR>\n" );
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document.write( "Let s = velocity required for the last 50 km<BR>\n" );
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document.write( "40 km time + 50 km time = 1.5 hrs<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=40%2F40 ALIGN=MIDDLE  ALT=\"40%2F40\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=50%2Fs ALIGN=MIDDLE  ALT=\"50%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 1.5<BR>\n" );
document.write( "1 + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=50%2Fs ALIGN=MIDDLE  ALT=\"50%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 1.5 <BR>\n" );
document.write( "subtract 1 from both sides<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=50%2Fs ALIGN=MIDDLE  ALT=\"50%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" > = .5<BR>\n" );
document.write( ".5s = 50<BR>\n" );
document.write( "s = 100 km/hr required for the last 50 km  </SPAN>\n" );
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