Q. 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 sec flight, its angle of elevation is changed to 30°. The speed of the aeroplane (taking √3 = 1.732) is
A) 230.93 m/sec
B) 230.63 m/sec
C) 236.25 m/sec
D) 235.85 m/sec
✔ Correct Answer: 230.93 m/sec
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