document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=809333>Question 809333</A>: <I><SPAN STYLE=\"word-break: break-all;\"> When a plane flies from Detroit to Denver it has to fly into the wind and the trip takes 4 hours. On the return trip, it will take only 3.5 hours because the plane is flying with the wind. If the distance between Detroit and Denver is 1120 miles, what was speed of the airplane in still air? What was the speed of the wind?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #487547 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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/cgi-bin/show-face.mpl?user=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=487547\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+ ALIGN=MIDDLE  ALT=\"+s+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the speed of the plane in still air in mi/hr<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=w+ ALIGN=MIDDLE  ALT=\"w+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the speed of the wind in mi/hr<BR>\n" );
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document.write( "Flying into the wind:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1120+=+%28+s+-+w+%29%2A4+ ALIGN=MIDDLE  ALT=\"+1120+=+%28+s+-+w+%29%2A4+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Flying with the wind:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1120+=+%28+s+%2B+w+%29%2A3.5+ ALIGN=MIDDLE  ALT=\"+1120+=+%28+s+%2B+w+%29%2A3.5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+4s+-+4w+=+1120+ ALIGN=MIDDLE  ALT=\"+4s+-+4w+=+1120+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and <BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+3.5s+%2B+3.5w+=+1120+ ALIGN=MIDDLE  ALT=\"+3.5s+%2B+3.5w+=+1120+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "Multiply (1) by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+3.5+ ALIGN=MIDDLE  ALT=\"+3.5+\"   DISABLED_style= \"max-width:90%; height:auto;\" > and<BR>\n" );
document.write( "(2) by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+4+ ALIGN=MIDDLE  ALT=\"+4+\"   DISABLED_style= \"max-width:90%; height:auto;\" > and add the equations<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+14s+-+14w+=+3920+ ALIGN=MIDDLE  ALT=\"+14s+-+14w+=+3920+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+14s+%2B+14w+=+4480+ ALIGN=MIDDLE  ALT=\"+14s+%2B+14w+=+4480+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+28s+=+8400+ ALIGN=MIDDLE  ALT=\"+28s+=+8400+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+300+ ALIGN=MIDDLE  ALT=\"+s+=+300+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and, <BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+4s+-+4w+=+1120+ ALIGN=MIDDLE  ALT=\"+4s+-+4w+=+1120+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+-+w+=+280+ ALIGN=MIDDLE  ALT=\"+s+-+w+=+280+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+300+-+w+=+280+ ALIGN=MIDDLE  ALT=\"+300+-+w+=+280+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+w+=+20+ ALIGN=MIDDLE  ALT=\"+w+=+20+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The speed of the airplane in still air is 300 mi/hr<BR>\n" );
document.write( "The speed of the wind is 20 mi/hr<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1120+=+%28+s+%2B+w+%29%2A3.5+ ALIGN=MIDDLE  ALT=\"+1120+=+%28+s+%2B+w+%29%2A3.5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1120+=+%28+300+%2B+20+%29%2A3.5+ ALIGN=MIDDLE  ALT=\"+1120+=+%28+300+%2B+20+%29%2A3.5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1120+=+320%2A3.5+ ALIGN=MIDDLE  ALT=\"+1120+=+320%2A3.5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1120+=+1120+ ALIGN=MIDDLE  ALT=\"+1120+=+1120+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "You can check other equation\r<BR>\n" );
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