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A straight highway leads to the foot of a tower.A man standing at the top of the tower observed a car at an angle of depression of `30^@`,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 `60^@`.Find the time taken by the car to reach the foot of the tower from this point.

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R G PUBLICATION-SOME APPLICATION OF TRIGONOMETRY-EXERCISE
  1. As observed from the top of a 75 m high lighthouse from the sea-level,...

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  2. A 1.2m tall girl spots a balloon moving with the wind in a horizontal ...

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  3. A straight highway leads to the foot of a tower.A man standing at the ...

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  4. The angles of elevation of the top of a tower from two points at a dis...

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  5. Find the length of a shadow of a vertical post of heigth 6m when the a...

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  6. Find the angle of elevation of then sun when the ratio of the length o...

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  7. Find the angle of elevation of the sun when the ratio of the length of...

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  8. The height of a tower is 10m.What is the length of its shadow when sun...

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  9. A vertical post of height 5sqrt3m above the horizontal ground casts a ...

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  10. The ratio of the length of a pole and its shadow is1:sqrt3.The angle o...

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  11. If the height and length of the shadow of a man are the same,then the ...

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  12. The length of the string of a kite flying at 100 mts above the ground ...

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  13. A tree casts a shadow 4m long on the ground,when the angle of elevatio...

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  14. The length of shadow of a tower on the plane ground is sqrt3 times the...

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  15. A vertical post of height 5sqrt3m above the horizontal ground casts a ...

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  16. What is the angle of elevation of sun when the length of the shadow of...

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  17. The angle of elevation of a post of height 55m as seen from the foot o...

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  18. A ladder 12m long is leaning on a wall.Its foot 6m away from the wall....

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  19. A ladder is kept standing at a slanting position against a wall of a h...

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  20. If the top of a temple subtends an angle of30^@ at a point on the grou...

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