Question 987541
r, plane's speed when no wind
w, speed of wind
t, time going DC to San F.
x, time back, San F. to DC
d, one-way distance
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FIND r and w;
{{{system(t=7.5,x=6,d=2400)}}}


Uniform Rates Rule for Travel:  RT=D relates rate, time, and distance.
From DC to San Francisco, travel is AGAINST the wind.
Returning from San Francisco TO DC, travel is WITH the wind.

<pre>
                      speed    time     distance
Wash DC to S.F.       r-w       t        d
S.F. back to DC       r+w       x        d
</pre>

{{{system((r-w)t=d,(r+w)x=d)}}}
Solve for r and w.