Question 1050791
<pre>
                    SPEED           TIME       DISTANCE
WITH WIND           200+w             t         500
AGAINST WIND        200-w=300         t          d
</pre>


{{{w=-100}}}


Fix your problem description.
200 mph if no wind.
300 mph against the wind.
300=200-w because the effect of going against the wind is to REDUCE the speed, to below 200 mph, which is contradiction to 300 mph "against" the wind.