document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1035209>Question 1035209</A>: <I><SPAN STYLE=\"word-break: break-all;\"> When an airplane flies with a given wind, it can travel 3500km in 5 hours. When the same airplane flies in opposite direction against the wind it takes 7 hours to fly the same pldistance. Find the air speed of the plane and the speed of the wind </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #649859 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=649859\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> So typical a type of travel rate exercise that this solution will be all in symbols, and will work for ALL of this type of exercise.\r<BR>\n" );
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document.write( "Known variables,  h,d,k<BR>\n" );
document.write( "Time with wind, h<BR>\n" );
document.write( "Time against wind, k<BR>\n" );
document.write( "Distance one way for trip, d\r<BR>\n" );
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document.write( "Unknown variables, r,w<BR>\n" );
document.write( "Air speed for plane absent any wind, r<BR>\n" );
document.write( "Speed of wind, w\r<BR>\n" );
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document.write( "<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( "                 RATE       TIME    DISTANCE\r\n" );
document.write( "WITHWIND         r+w          h       d\r\n" );
document.write( "AGAINSTWIND      r-w          k       d\r\n" );
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document.write( "Starting System of Equations:  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28%28r%2Bw%29h=d%2C%28r-w%29k=d%29 ALIGN=MIDDLE  ALT=\"system%28%28r%2Bw%29h=d%2C%28r-w%29k=d%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Solve this system for r and w.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28rh%2Bwh=d%2Crk-wk=d%29 ALIGN=MIDDLE  ALT=\"system%28rh%2Bwh=d%2Crk-wk=d%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=rh=d-wh ALIGN=MIDDLE  ALT=\"rh=d-wh\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=%28d-wh%29%2Fh ALIGN=MIDDLE  ALT=\"r=%28d-wh%29%2Fh\"   DISABLED_style= \"max-width:90%; height:auto;\" >-----*  and you might return to this formula later.<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%28d-wh%29%2Fh%29k-wk=d ALIGN=MIDDLE  ALT=\"%28%28d-wh%29%2Fh%29k-wk=d\"   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=%28dk-whk%29%2Fh-wk=d ALIGN=MIDDLE  ALT=\"%28dk-whk%29%2Fh-wk=d\"   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=dk-whk-whk=dh ALIGN=MIDDLE  ALT=\"dk-whk-whk=dh\"   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=-2whk=dh-dk ALIGN=MIDDLE  ALT=\"-2whk=dh-dk\"   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=2whk=dk-dh ALIGN=MIDDLE  ALT=\"2whk=dk-dh\"   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=highlight%28w=%28dk-dh%29%2F%282hk%29%29 ALIGN=MIDDLE  ALT=\"highlight%28w=%28dk-dh%29%2F%282hk%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Use w to determine value for r.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=%28d-wh%29%2Fh ALIGN=MIDDLE  ALT=\"r=%28d-wh%29%2Fh\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=%28d-%28%28dk-kh%29%2F%282hk%29%29h%29%2Fh ALIGN=MIDDLE  ALT=\"r=%28d-%28%28dk-kh%29%2F%282hk%29%29h%29%2Fh\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=%28d-%28dk-kh%29%2F%282k%29%29%2Fh ALIGN=MIDDLE  ALT=\"r=%28d-%28dk-kh%29%2F%282k%29%29%2Fh\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=d%2Fh-%28dk-hk%29%2F%282kh%29 ALIGN=MIDDLE  ALT=\"r=d%2Fh-%28dk-hk%29%2F%282kh%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >,   LCD is 2kh;<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=%28d%2Fh%29%282k%29%2F%282k%29-%28dk-hk%29%2F%282kh%29 ALIGN=MIDDLE  ALT=\"r=%28d%2Fh%29%282k%29%2F%282k%29-%28dk-hk%29%2F%282kh%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=%282dk-%28dk-hk%29%29%2F%282kh%29 ALIGN=MIDDLE  ALT=\"r=%282dk-%28dk-hk%29%29%2F%282kh%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=%282dk-dk%2Bhk%29%2F%282kh%29 ALIGN=MIDDLE  ALT=\"r=%282dk-dk%2Bhk%29%2F%282kh%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=%28dk%2Bhk%29%2F%282kh%29 ALIGN=MIDDLE  ALT=\"r=%28dk%2Bhk%29%2F%282kh%29\"   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=%28d%2Bh%29%2F%282h%29%29 ALIGN=MIDDLE  ALT=\"highlight%28r=%28d%2Bh%29%2F%282h%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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