document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=334172>Question 334172</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A man drove the first 75 miles of a trip at an average of 50mph.  He then drove the next 150 miles at an average of 60 mph.  What was his average speed in mph for the trip? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #239468 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=239468\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A man drove the first 75 miles of a trip at an average of 50mph.<BR>\n" );
document.write( " He then drove the next 150 miles at an average of 60 mph.<BR>\n" );
document.write( " What was his average speed in mph for the trip?<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Let a = average speed for the trip<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Write a time equation, time = dist/speed<BR>\n" );
document.write( "Total trip dist = 75 + 150 = 225<BR>\n" );
document.write( ":<BR>\n" );
document.write( "50mph time + 60mph time = total time<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=75%2F50 ALIGN=MIDDLE  ALT=\"75%2F50\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=150%2F60 ALIGN=MIDDLE  ALT=\"150%2F60\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=225%2Fa ALIGN=MIDDLE  ALT=\"225%2Fa\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ":<BR>\n" );
document.write( "Multiply by 300a to get rid of the denominators, results<BR>\n" );
document.write( "6a(75) + 5a(150) = 300(225)<BR>\n" );
document.write( ":<BR>\n" );
document.write( "450a + 750a = 67500<BR>\n" );
document.write( ":<BR>\n" );
document.write( "1200a = 67500<BR>\n" );
document.write( "a = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=67500%2F1200 ALIGN=MIDDLE  ALT=\"67500%2F1200\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "a = 56.25 mph is the average speed<BR>\n" );
document.write( ":<BR>\n" );
document.write( ":<BR>\n" );
document.write( "See if that is true, find the times:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=75%2F50 ALIGN=MIDDLE  ALT=\"75%2F50\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=150%2F60 ALIGN=MIDDLE  ALT=\"150%2F60\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=225%2F56.25 ALIGN=MIDDLE  ALT=\"225%2F56.25\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "1.5 + 2.5 = 4 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );