The angle of elevation of an aeroplane from a point A on the ground is 60°. After a flight of 30 s,
the angle of elevation change to 30°. If the plane is flying at a constant height of 3600 √3 m, then
find the speed in km/h of the plane. [take, √3 = 1.732]
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The plane Travels 7200 m in 30 seconds. Hence, speed of plane= 864 km/h
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