Question 993560
Let w be the wind's speed.
{{{system(a=4,b=6&1/2,c=1040)}}}

<pre>
DIRECTION      RATE      TIME      DISTANCE
WITHWIND       r+w        a         c
AGAINSTW       r-w        b         c
</pre>


Your system of equations in the UNKNOWNS r and w, is
{{{system((r+w)*a=c,(r-w)*b=c)}}}, and hopefully you know what to do with this  (and you should solve completely in symbols first).