The angle of elevation of an aeroplane from a point A on the ground is – InterviewSolution

1.	The angle of elevation of an aeroplane from a point A on the ground is 60°. Afteraflight of 30 seconds, the angle of elevation changes to 30°. Ifthe plane is flying atconstant height of 3600 /3 m, find the speed in km/hour of the plane.
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