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A flag staff of 5m high stands on a buil...

A flag staff of 5m high stands on a building of 25m high. At an observer at a height of 30 m. The flag staff and the building subtend equal angles . The distance of the observer from the top of the flag staff is

A

`(5sqrt3)/2`

B

`5sqrt(3/2)`

C

`5sqrt2/3`

D

none of these

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The correct Answer is:
B
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OBJECTIVE RD SHARMA ENGLISH-HEIGHTS AND DISTANCES-Exercise
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  2. A flag staff of 5m high stands on a building of 25m high. At an obse...

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  3. ABC is a triangular park with AB=AC=100 m .A clock tower is situated a...

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  4. If a flag-staff of 6 m height placed on the top of a tower throws a sh...

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  5. The angle of elevation of the top of an incomplete vertical pillar at ...

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  6. The top of a hill observed from the top and bottom of a building of he...

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  7. The angles of elevation of a cliff at a point A on the ground and at a...

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  8. The angle of elevation of a cloud from a point h mt. above is theta^@ ...

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  9. On the level ground, the angle of elevation of a tower is 30^(@). O...

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  10. Each side of an equilateral triangle subtends an angle of 60^(@) at th...

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  11. The angle of elevation of the top of a tower at any point on the groun...

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  12. Form the top of a light house 60 m high with its base at the sea-level...

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  13. A person standing on the bank of a river observes that the angle subte...

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  14. AB is a vertical pole. The end A is on the level ground .C is the midd...

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  15. A tree is broken by wind, its upper part touches the ground at a point...

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  16. about to only mathematics

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  17. A tower subtends an angle alpha at a point A in the plane of its...

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  18. The angle of elevation of the top of a tower standing on a horizontal ...

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  19. From an aeroplane vertically above a straight horizontal road, the ...

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  20. A vertical tower stands on a declivity which is inclined at 15^(@) to ...

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