A man on top of a tower watches a car approaching the tower at a uniform speed. The angle of depression of the car changes from 30° to 60° in 12 minutes. How much more time will the car take to reach the foot of the tower?
Correct answer A. 6 minutes
Explanation
Distances are h√3 and h/√3. Distance covered = 2h/√3 in 12 min. Remaining h/√3 is half of that, so time = 6 minutes.
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