A man on the top of a rock observed a boat coming towards the rock with a uniform speed. It takes `15` minutes for the a

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Q 3030191012.     A man on the top of a rock observed a boat coming towards the rock with a uniform speed. It takes `15` minutes for the angle of depression to change from `30^{\circ}` to ` 60^{\circ}` then what time will the boat take to reach the shore?
A

`5` mintues

B

`10` mintues

C

`7\frac{1}{2}` mintues

D

` 2\frac{1}{2}` mintues

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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