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A straight highway leads to the foot of a tower. Ramaiah standing at the top of the tower observe a car at an angle of depression `30^(@)`. The car 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 `60^(@)`. Find the time taken by the car to reach the foot of the tower from this point.

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VGS PUBLICATION-BRILLIANT-APPLICATIONS OF TRIGONOMETRY-EXERCISE
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  14. You want to erect a pole of height 10 m with the support of three rope...

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  15. Suppose you are shooting an arrow from the top of a building at a heig...

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  16. An electrician wants to repair an electric connection on a pole of hei...

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  17. A boat had to cross a river. It crosses the river by making an angle o...

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  18. An observer of height 1.8 m is 13.2 m away from a palm tree. The angle...

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  19. In the given figure, AC= 6 cm, AB= 5 cm and /BAC=30^(@). Find the area...

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  20. Two men on either side of a temple of 30 meter height observe its top ...

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  21. A straight highway leads to the foot of a tower. Ramaiah standing at t...

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