document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=397647>Question 397647</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Donna drove half the distance of a trip at 40 mi/h. At what speed would she have to drive for the rest of the distance so that the average speed for the entire trip would be 45 mi/h? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #281732 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><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=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=281732\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let d = total distance<BR>\n" );
document.write( "x = speed in the 2nd half of trip<BR>\n" );
document.write( "==> length of time in 1st half of trip  = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28d%2F2%29%2F40+=+d%2F80 ALIGN=MIDDLE  ALT=\"%28d%2F2%29%2F40+=+d%2F80\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "length of time in 2nd half of trip = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28d%2F2%29%2Fx++=d%2F%282x%29 ALIGN=MIDDLE  ALT=\"%28d%2F2%29%2Fx++=d%2F%282x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Then\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F%28d%2F80++%2B+d%2F%282x%29%29+=+45 ALIGN=MIDDLE  ALT=\"d%2F%28d%2F80++%2B+d%2F%282x%29%29+=+45\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F%281%2F80++%2B+1%2F%282x%29%29+=+45 ALIGN=MIDDLE  ALT=\"1%2F%281%2F80++%2B+1%2F%282x%29%29+=+45\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F45+=+1%2F80++%2B+1%2F%282x%29 ALIGN=MIDDLE  ALT=\"1%2F45+=+1%2F80++%2B+1%2F%282x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=7%2F720+=+1%2F%282x%29 ALIGN=MIDDLE  ALT=\"7%2F720+=+1%2F%282x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > ==> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+360%2F7%0D%0A ALIGN=MIDDLE  ALT=\"x+=+360%2F7%0D%0A\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi/hr. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );