Considering the direction of the wind, it is found that the plane's speed needs to be of 520 knots.
The ground speed, considering that the wind is flowing from Kansas City to Washington, and the trip is Washington to Kansas City, is given by:
G = Plane speed - Wind speed.
Hence:
450 knows = Plane speed - 70 knots.
Plane speed = 520 knots.
A similar problem, involving plane and wind's speed, is given at https://brainly.com/question/25547425
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