A man on the top of a vertical tower obs...

A man on the top of a vertical tower observes a car moving at a uniform speed coming directly towards it. If it takes 12 minutes for the angle of depression to change from `30^0to45^0,` how soon after this will the car reach the tower? Give your answer to the nearest second.

14 min. 35 sec.

15 min. 49 sec.

16 min. 23 sec

18 min. 5 sec.

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