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The angle of elevation of an aeroplane from a point on the ground is 60 deg. After flying for 30 seconds, the angle of elevation changes to 30 deg. If the aeroplaneis flying at a height of 4500 m, then what is the speed (in m/s) of aeroplane?

The angle of elevation of an aeroplane from a point on the ground is 60 deg. After flying for 30 seconds, the angle of elevation changes to 30 deg. If the aeroplaneis flying at a height of 4500 m, then what is the speed (in m/s) of aeroplane? Correct Answer 100\u221a3

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