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From a 15 m high bridge on the river, the angle of depression of a boat is 30°. If the speed of the boat be 6 Km/h, then the time taken by the boat to reach exactly below the bridge will be :

9 √3 second
19 / √3 second
3 √3 second
None of these

Correct Answer: 9 √3 second

Explanation:

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