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A vertical tower stands on a declicity w...

A vertical tower stands on a declicity which is inclined at `15^@` to the horizon. From the foot of the tower a man ascends the declivity for 80 feet and then finds that the tower substends an angle of `30^@` . The height of the tower is

A

`20(sqrt6-sqrt2)`

B

`40(sqrt6-sqrt2)`

C

`40(sqrt6+sqrt2)`

D

none of these

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The correct Answer is:
B
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OBJECTIVE RD SHARMA-HEIGHTS AND DISTANCES-Exercise
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  4. The angle of elevation of an object on a hill from a point on the grou...

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  6. .A house of height 100 m substends a right angle at the window of an o...

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  8. A man of height 6 ft. observes the top of a tower and the foot of th...

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  9. If the elevation of the sun is 30^@ , then the length of the shadow c...

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  10. A ladder rests against a vertical wall at angle alpha to the horizonta...

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  11. From the top of a cliff 300 metres high, the top of a tower was obser...

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  13. A person standing on the bank of a river finds that the angle of elev...

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  14. A tower subtends an angle of 30^@ at a point on the same level as the ...

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  15. AB is a vertical pole and C is its mid point. The end A is on the leve...

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  16. The angle of depression of a point situated at a distance of 70 metres...

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  17. The angle of elevation of the top of a vertical tower from two points ...

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  18. An aeroplane flying horizontally , 1km above the ground , is observed...

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  19. At the foot of the mountain the elevation of its summit is 45^@, after...

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  20. At a distance 12 metres from the foot A of a tower AB of height 5 met...

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