document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=983571>Question 983571</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A person covers a certain distance on car. Had he moved 30 km/hr faster, he would have taken 2.5 hrs less. If he has moved 10 km h slower, he would have taken 2.5hrs more. What is his original speed. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #604484 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39799)</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=604484\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\">\r\n" );
document.write( "                speed        time       distance    EQUATIONS\r\n" );
document.write( "NORMAL           r            t          d          rt=d\r\n" );
document.write( "FASTER          r+30         t-2.5       d          (r+30)(t-2.5)=d\r\n" );
document.write( "SLOWER          r-10         t+2.5       d          (r-10)(t+2.5)=d\r\n" );
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document.write( "Additional equation might help:          (r+30)(t-2.5)=(r-10)(t+2.5)\r\n" );
document.write( "</PRE>\r<BR>\n" );
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document.write( "FAST equation<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=rt%2B30t-2.5r-75=d ALIGN=MIDDLE  ALT=\"rt%2B30t-2.5r-75=d\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2B30t-2.5r-75=d ALIGN=MIDDLE  ALT=\"d%2B30t-2.5r-75=d\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=30t-2.5r-75=0 ALIGN=MIDDLE  ALT=\"30t-2.5r-75=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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document.write( "SLOW equation<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=rt-10t%2B2.5r-25=d ALIGN=MIDDLE  ALT=\"rt-10t%2B2.5r-25=d\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-10t%2B2.5r-25=0 ALIGN=MIDDLE  ALT=\"-10t%2B2.5r-25=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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document.write( "The additional equation in the table is not necessary.\r<BR>\n" );
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document.write( "The equations as found can be simplified for convenience if multiply each by 2.<BR>\n" );
document.write( "Those as a system of equations:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%2860t-5r-150=0%2C-20t%2B5r-50=0%29 ALIGN=MIDDLE  ALT=\"system%2860t-5r-150=0%2C-20t%2B5r-50=0%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and then further<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%2812t-r-30=0%2C4t-r%2B10=0%29 ALIGN=MIDDLE  ALT=\"system%2812t-r-30=0%2C4t-r%2B10=0%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Elimination Method is perfectly convenient for the system.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=12t-r-30-%284r-r%2B10%29=0-0 ALIGN=MIDDLE  ALT=\"12t-r-30-%284r-r%2B10%29=0-0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8r-30-10=0 ALIGN=MIDDLE  ALT=\"8r-30-10=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8r=40 ALIGN=MIDDLE  ALT=\"8r=40\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28highlight%28r=5%29%29 ALIGN=MIDDLE  ALT=\"highlight%28highlight%28r=5%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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