document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1200577>Question 1200577</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A plane with a tailwind flew 1920 mi in 8 hours. On the return trip, against the wind, the<BR>\n" );
document.write( "plane flew the same distance in 12 hours. What is the speed of the plane in calm air and<BR>\n" );
document.write( "the speed of the tailwind?\r<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 #834743 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39620)</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=834743\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> UNKNOWN NUMBERS<BR>\n" );
document.write( "r, speed if no wind<BR>\n" );
document.write( "w, speed of the wind<BR>\n" );
document.write( "KNOWN, GIVEN VALUES<BR>\n" );
document.write( "d, distance either way about destination<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5Bp%5D ALIGN=MIDDLE  ALT=\"t%5Bp%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >, time flown with the wind<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5Bm%5D ALIGN=MIDDLE  ALT=\"t%5Bm%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >, time flown against the wind\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28r%2Bw=d%2Ft%5Bp%5D%2Cr-w=d%2Ft%5Bm%5D%29 ALIGN=MIDDLE  ALT=\"system%28r%2Bw=d%2Ft%5Bp%5D%2Cr-w=d%2Ft%5Bm%5D%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%2Bw%2Br-w=d%2Ft%5Bp%5D%2Bd%2Ft%5Bm%5D ALIGN=MIDDLE  ALT=\"r%2Bw%2Br-w=d%2Ft%5Bp%5D%2Bd%2Ft%5Bm%5D\"   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=2r=d%281%2Ft%5Bp%5D%2B1%2Ft%5Bm%5D%29 ALIGN=MIDDLE  ALT=\"2r=d%281%2Ft%5Bp%5D%2B1%2Ft%5Bm%5D%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=highlight_green%28r=%28d%2F2%29%28%28t%5Bm%5D%2Bt%5Bp%5D%29%2F%28t%5Bp%5Dt%5Bm%5D%29%29%29 ALIGN=MIDDLE  ALT=\"highlight_green%28r=%28d%2F2%29%28%28t%5Bm%5D%2Bt%5Bp%5D%29%2F%28t%5Bp%5Dt%5Bm%5D%29%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "--\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2w=d%281%2Ft%5Bp%5D-1%2Ft%5Bm%5D%29 ALIGN=MIDDLE  ALT=\"2w=d%281%2Ft%5Bp%5D-1%2Ft%5Bm%5D%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=highlight_green%28w=%28d%2F2%29%28%28t%5Bm%5D-t%5Bp%5D%29%2F%28t%5Bp%5Dt%5Bm%5D%29%29%29 ALIGN=MIDDLE  ALT=\"highlight_green%28w=%28d%2F2%29%28%28t%5Bm%5D-t%5Bp%5D%29%2F%28t%5Bp%5Dt%5Bm%5D%29%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Your example uses variables assigned<BR>\n" );
document.write( "d=1920 miles<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5Bp%5D=8 ALIGN=MIDDLE  ALT=\"t%5Bp%5D=8\"   DISABLED_style= \"max-width:90%; height:auto;\" > hours<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5Bm%5D=12 ALIGN=MIDDLE  ALT=\"t%5Bm%5D=12\"   DISABLED_style= \"max-width:90%; height:auto;\" > hours </SPAN>\n" );
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