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A boat is moving away from an observation tower. It makes an angle of depression of 60° with an observer's eye when at a distance of 50m from the tower. After 8 sec., the angle of depression becomes 30°. By assuming that it is running in still water, the approximate speed of the boat is

33 km/hr
42 km/hr
45 km/hr
50 km/hr

Correct Answer: 45 km/hr

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