Question 1177337
<pre>
s, speed if no wind
w, speed of the wind

                      SPEED         TIME       DISTANCE

WITH WIND            s+w                2          920

AGAINST WIND         s-w                4          920
</pre>
Distance Divided By Time is speed.


{{{system(s+w=920/2,s-w=920/4)}}}


{{{system(s+w=460,s-w=230)}}}

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