Answer: The speed of the plane is 275 m/h and that of the wind, is 25 m/h.
Explanation:
1000/4 = 250 mph
1000/(10/3) = 300 mph
The plane's airspeed is the average (250 + 300)/2 = 275 mph
The windspeed is the difference, 275 - 250 = 25 mph
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