document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=722710>Question 722710</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a candy truck leaves the store at 5:00 am each mornng on its 144 mile route.one day the driver gets a late start and does not leave the store until 5:30 am. to finish his route on time the driver drives 4 miles per hour faster than usual.at what speed does he usually drive ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #442863 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39617)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=442863\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> normal speed r in miles per hour.  The difference between 5:00am and 5:30am is 1/2 hour.\r<BR>\n" );
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document.write( "____________speed________________time____________________distance<BR>\n" );
document.write( "normal_______r___________________<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=144%2Fr ALIGN=MIDDLE  ALT=\"t=144%2Fr\"   DISABLED_style= \"max-width:90%; height:auto;\" >_______________________144<BR>\n" );
document.write( "late________r+4__________________<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t-1%2F2=144%2F%28r%2B4%29 ALIGN=MIDDLE  ALT=\"t-1%2F2=144%2F%28r%2B4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >___________________144\r<BR>\n" );
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document.write( "The normal time being 1/2 hour more than the late time suggests taking the difference between their expressions.  Both expressions may be shown as expressions using r, the rate.\r<BR>\n" );
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document.write( "normal time minus late time equals 1/2 hour,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28144%2Fr-144%2F%28r%2B4%29=1%2F2%29 ALIGN=MIDDLE  ALT=\"highlight%28144%2Fr-144%2F%28r%2B4%29=1%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "Multiply left side and right side by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2r%28r%2B4%29 ALIGN=MIDDLE  ALT=\"2r%28r%2B4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > to clear the fractions.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=288%28r%2B4%29-288r=r%28r%2B4%29 ALIGN=MIDDLE  ALT=\"288%28r%2B4%29-288r=r%28r%2B4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=288r%2B1152-288r=r%5E2%2B4r ALIGN=MIDDLE  ALT=\"288r%2B1152-288r=r%5E2%2B4r\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1152=r%5E2%2B4r ALIGN=MIDDLE  ALT=\"1152=r%5E2%2B4r\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28r%5E2%2B4r-1152=0%29 ALIGN=MIDDLE  ALT=\"highlight%28r%5E2%2B4r-1152=0%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, .\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=%28-4%2Bsqrt%2816-4%2A%28-1152%29%29%29%2F2=%2868-4%29%2F2 ALIGN=MIDDLE  ALT=\"r=%28-4%2Bsqrt%2816-4%2A%28-1152%29%29%29%2F2=%2868-4%29%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "=32 miles per hour --- ANSWER. </SPAN>\n" );
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