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A man on the top of a tower: standing on the seashore: finds that a boat coming towards him takes 10 min for the angle of depression to change from 30 to 60. Find the time taken by the boat to reach the shore from this position

A

5 min

B

10 min

C

`sqrt3` min

D

None of these

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The correct Answer is:
A
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A man on the top of a tower,standing on the seashore,finds that a boat coming towards him takes 10 minutes for the angle of depression to change from 30o to 60o. Find the time taken by the boat to reach the shore from the position.

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