A man on the top of a rock lying on a sea shore observes a boat coming towards it. If it takes `10` minutes for the angl

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Q 3010178919.     A man on the top of a rock lying on a sea shore observes a boat coming towards it. If it takes `10` minutes for the angles of depression to change from ` 30^{0}` to ` 60^{0} ` how soon will the boat reach the shore ?
A

20 minutes

B

15 minutes

C

10 minutes

D

5 minutes

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

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