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A person from the top of a hill observes...

A person from the top of a hill observes a vehicle moving towards him at a uniform speed. It takes 10 minutes for the angle of depression to change from `45^(@)` to `60^(@)`. After this the time required by the vehicle to reach the bottom of the hill is:

A

12 min 20 sec

B

13 min

C

13 min 40 sec

D

14 min 24 sec

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