A straight highway leads to the foot of a tower. A man standing at | Filo
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Some Applications of Trigonometry

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A straight highway leads to the foot of a tower. A man standing at the top of the tower observes a car at an angle of depression of , which is approaching the foot of the tower with a uniform speed. Six seconds later, the angle of depression of the car is found to be . Find the time taken by the car to reach the foot of the tower from this point.

Solution: Let
     ....(1)
      ...(2)
from (1) and (2)
from A to B
speed
required
time
     
sec
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