document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=973125>Question 973125</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Mr. Castro drove 30 miles in the construction zone, and 120 miles on the<BR>\n" );
document.write( "highway. The total time for his trip was 3 hours, Find his speed on the<BR>\n" );
document.write( "highway if he was driving 30 miles per hour faster on the highway.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #595370 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=595370\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Mr. Castro drove 30 miles in the construction zone, and 120 miles on the<BR>\n" );
document.write( "highway. The total time for his trip was 3 hours, Find his speed on the<BR>\n" );
document.write( "highway if he was driving 30 miles per hour faster on the highway.<BR>\n" );
document.write( "***<BR>\n" );
document.write( "let x=Mr. Castro's speed in the construction zone<BR>\n" );
document.write( "x+30=Mr. Castro's speed on the highway<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=30%2Fx%2B120%2F%28x%2B30%29=3 ALIGN=MIDDLE  ALT=\"30%2Fx%2B120%2F%28x%2B30%29=3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "lcd:x(x+30)<BR>\n" );
document.write( "30(x+30)+120x=3x(x+30)<BR>\n" );
document.write( "30x+900+120x=3x^2+90x<BR>\n" );
document.write( "3x^2-60x-900=0<BR>\n" );
document.write( "x^2-20x-300=0<BR>\n" );
document.write( "(x+10)(x-30)=0<BR>\n" );
document.write( "x=30<BR>\n" );
document.write( "x+30=60<BR>\n" );
document.write( "Mr. Castro's speed on the highway=60 mph </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );