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Question

The angle of elevation of an aeroplane from a point on the ground is 60°. After 20 seconds flight the elevation changes to 30°, if the aeroplane is flying at a height of 3000√3
m. find the speed of the aeroplane.

A 240 m/sec

B 120 m/sec

C 160 m/sec

D 300 m/sec

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