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An aeroplane flying horizontally at a height of 3 Km. above the ground is observed at a certain point on earth to subtend an angle of 60°. After 15 secflight, its angle of elevation is changed to 30°. The speed of the aeroplane (taking √3 = 1.732) is

An aeroplane flying horizontally at a height of 3 Km. above the ground is observed at a certain point on earth to subtend an angle of 60°. After 15 secflight, its angle of elevation is changed to 30°. The speed of the aeroplane (taking √3 = 1.732) is Correct Answer 230.93 m\/sec

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