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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 `45o` with the mans eye when at a distance of 60 metres from the tower. After 5 seconds, the angle of depression becomes `30o` . What is the approximate speed of the boat, assuming that it is running in still water? (a) 32 kmph (b) 36 kmph (c) 38 kmph (d) 40 kmph (d) 42 kmph

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