An airforce office at signal station observes a UFO (Unidentified Flying Object) at an altitude 1200 m flying towards his station at an angle of elevation 30°. After exactly 60 seconds he observes the angle of elevation has changed to 60°. Find the distance covered by plane in 1 minute.

Options
- 13856 m
- 12400 m
- 14500 m
- 13000 m

CORRECT ANSWER : 13856 m

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