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The angle of elevation of an aeroplane from a point on the ground is 60. After a flight of 30 seconds the angle of elevation

The angle of elevation of an aeroplane from a point on the ground is 60°. After a flight of 30 seconds the angle of elevation becomes 30°. If the aeroplane is flying at a constant height of 3000?3 m, find the speed of the aeroplane.

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