The angle of elevation of a jet plane from a point a on the ground is 60 after a flight of 30 sec
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The angle of elevation of an aeroplane from a point on the ground is 60 degree after a flight of 30 seconds the angle of elevation changes to 30 degree if the plane is flying at a constant height of 3600 under root 3 M find the speed of the plane in kilometre per hour.
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