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UPSC CDS 1 2023 Math Paper

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Question : 54

Total: 100

A person on the top of a vertical tower observes a car moving at a uniform speed coming directly towards it. If it takes 6 minutes for the angle of depression to change from 30° to 45°, and further t minutes to reach the tower, which one of the following is correct ?

7.7 < t < 8
8 < t < 8.3
8.3 < t < 8.6
8.6 < t < 8.9

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