document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=915560>Question 915560</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A tour bus leaves Sacramento every Friday evening at 5:00 P.M. for a 264-mile trip to Las Vegas. This week, however, the bus leaves at 5:15 P.M. To arrive in Las Vegas on time, the driver drives 8 miles per hour faster than usual. What is the bus's usual speed?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #555666 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=555666\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A tour bus leaves Sacramento every Friday evening at 5:00 P.M. for a 264-mile trip to Las Vegas. This week, however, the bus leaves at 5:15 P.M. To arrive in Las Vegas on time, the driver drives 8 miles per hour faster than usual. What is the bus's usual speed? <BR>\n" );
document.write( "***<BR>\n" );
document.write( "let x=bus's usual speed<BR>\n" );
document.write( "x+8=bus's faster speed<BR>\n" );
document.write( "15 min=1/4 hr<BR>\n" );
document.write( "travel time=distance/speed<BR>\n" );
document.write( "..<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=264%2Fx-264%2F%28x%2B8%29=1%2F4 ALIGN=MIDDLE  ALT=\"264%2Fx-264%2F%28x%2B8%29=1%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "lcd:x(x+8)<BR>\n" );
document.write( "264(x+8)-264x=x(x+8)/4<BR>\n" );
document.write( "264x+2112-264x=(x^2+8x)/4<BR>\n" );
document.write( "8448=x^2+8x<BR>\n" );
document.write( "x^2+8x-8448=0<BR>\n" );
document.write( "solve for x by quadratic formula: <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "a=1, b=8, c=-8448<BR>\n" );
document.write( "ans: <BR>\n" );
document.write( "x=-96 (reject)<BR>\n" );
document.write( "or<BR>\n" );
document.write( "x=88<BR>\n" );
document.write( "bus's usual speed=88 mph                   \r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );