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1. |
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. | 13 min 40 sec |
B. | 14 min 24 sec |
C. | 12 min 20 sec |
D. | 13 min |
Answer» B. 14 min 24 sec | |