document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=72142>Question 72142</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0395977258/algebrahomeworkh>Algebra and Trigonometry: Structure and Method </A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Because of traffic Maria could average only 40 km/h for the first 20% of her trip, but she averaged 75 km/h for the whole trip.  What was her average speed for the last 80% of her trip? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #51559 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley75><B>checkley75(3666)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley75><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=51559\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 40*.2+x*.8=75<BR>\n" );
document.write( "8+.8x=75<BR>\n" );
document.write( ".8x=75-8<BR>\n" );
document.write( ".8x=67<BR>\n" );
document.write( "x=67/.8<BR>\n" );
document.write( "x=83.75 km/h<BR>\n" );
document.write( "proof<BR>\n" );
document.write( ".2*40+.8*83.75=75<BR>\n" );
document.write( "8+67=75<BR>\n" );
document.write( "75=75 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );