document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=564711>Question 564711</A>: <I><SPAN STYLE=\"word-break: break-all;\"> you drive to the beach at a rate of 120 kilometers per hour. On the return trip you drive at a rate of 60 kilometers per hour. What is your average speed for the entire trip? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #365542 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=365542\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> you drive to the beach at a rate of 120 kilometers per hour.<BR>\n" );
document.write( " On the return trip you drive at a rate of 60 kilometers per hour.<BR>\n" );
document.write( " What is your average speed for the entire trip?<BR>\n" );
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document.write( "Let a = the average speed for the whole trip<BR>\n" );
document.write( "let d = the one-way distance of the trip<BR>\n" );
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document.write( "Write time equation, time = dist/speed<BR>\n" );
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document.write( "To time + return time = total time<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F120 ALIGN=MIDDLE  ALT=\"d%2F120\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F60 ALIGN=MIDDLE  ALT=\"d%2F60\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%282d%29%2Fa ALIGN=MIDDLE  ALT=\"%282d%29%2Fa\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply by 120a<BR>\n" );
document.write( "120a*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F120 ALIGN=MIDDLE  ALT=\"d%2F120\"   DISABLED_style= \"max-width:90%; height:auto;\" > + 120a*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F60 ALIGN=MIDDLE  ALT=\"d%2F60\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 120a*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%282d%29%2Fa ALIGN=MIDDLE  ALT=\"%282d%29%2Fa\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "cancel the denominators<BR>\n" );
document.write( "ad + 2ad = 120(2d)<BR>\n" );
document.write( "3ad = 240d<BR>\n" );
document.write( "Divide both sides by d<BR>\n" );
document.write( "3a = 240<BR>\n" );
document.write( "a = 240/3<BR>\n" );
document.write( "a = 80 km/hr is the av speed for the round trip </SPAN>\n" );
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