document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1107071>Question 1107071</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A car drove from a city A to a city B.The distance between the two cities is 350 km.After 200km, the speed of the car decreased by 20 km/h. The total trip took 5 hours. Find the speed of the car in the first part of the journey. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #722074 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39630)</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=722074\">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\r\n" );
document.write( "part1                r         200/r         200\r\n" );
document.write( "part2               r-20       150/(r-20)    150\r\n" );
document.write( "total                          5\r\n" );
document.write( "</PRE>\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=200%2Fr%2B150%2F%28r-20%29=5 ALIGN=MIDDLE  ALT=\"200%2Fr%2B150%2F%28r-20%29=5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Simplify and solve this for r.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=40%2Fr%2B30%2F%28r-20%29=1 ALIGN=MIDDLE  ALT=\"40%2Fr%2B30%2F%28r-20%29=1\"   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=40%28r-20%29%2B30r=r%5E2-20r ALIGN=MIDDLE  ALT=\"40%28r-20%29%2B30r=r%5E2-20r\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=40r-800%2B30r=r%5E2-20r ALIGN=MIDDLE  ALT=\"40r-800%2B30r=r%5E2-20r\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E2-20r-70r-800=0 ALIGN=MIDDLE  ALT=\"r%5E2-20r-70r-800=0\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E2-90r-800=0 ALIGN=MIDDLE  ALT=\"r%5E2-90r-800=0\"   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=%2890%2B-+sqrt%288100%2B4%2A800%29%29%2F2 ALIGN=MIDDLE  ALT=\"r=%2890%2B-+sqrt%288100%2B4%2A800%29%29%2F2\"   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=%2890%2B-+sqrt%284900%29%29%2F2 ALIGN=MIDDLE  ALT=\"r=%2890%2B-+sqrt%284900%29%29%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=%2890%2B-+70%29%2F2 ALIGN=MIDDLE  ALT=\"r=%2890%2B-+70%29%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=%2845%2B-+35%29 ALIGN=MIDDLE  ALT=\"r=%2845%2B-+35%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cross%28r=5%29 ALIGN=MIDDLE  ALT=\"cross%28r=5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28r=80%29 ALIGN=MIDDLE  ALT=\"highlight%28r=80%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "The 80 km per hour is the one which makes sense. </SPAN>\n" );
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