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A man is watching from the top of a tower a boat speeding away from the tower. The boat makes an angle of depression of 45° with the man's eye when at a distance of 60 meter from the tower. After 5 second, the angle of depression becomes 30°. What is the approximate speed of the boat, assuming it is running in still water?

32 Km/h
42 Km/h
38 Km/h
36 Km/h

Correct Answer: 32 Km/h

Explanation:

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