document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=726221>Question 726221</A>: <I><SPAN STYLE=\"word-break: break-all;\"> rachel drove 780 miles. if she had drove 5 mph faster, the trip would have taken 1 hour less. How fast did she drive? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #444525 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=444525\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> rachel drove 780 miles. if she had drove 5 mph faster, the trip would have taken 1 hour less. How fast did she drive?<BR>\n" );
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document.write( "Slower trip DATA:<BR>\n" );
document.write( "distance = 780 ; rate = r mph ; time = 780/r hours<BR>\n" );
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document.write( "Faster trip DATA:<BR>\n" );
document.write( "distance = 780 ; rate = r+5 mph  ; time = 780/(r+5) hours<BR>\n" );
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document.write( "Equation:<BR>\n" );
document.write( "time - time = 1 hour<BR>\n" );
document.write( "780/r - 780/(r+5) = 1 hr<BR>\n" );
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document.write( "780r + 780*5 - 780r = r(r+5)<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "r^2+5r-5*780 = 0<BR>\n" );
document.write( "----<BR>\n" );
document.write( "r = 60 mph<BR>\n" );
document.write( "==============<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );