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A man on the top of a tower, standing on the seashore, finds that a boat coming towards him takes 10 minutes for the angle of depression to change from `30o` to `60o` . Find the time taken by the boat to reach the shore from the position.

A

20 minutes

B

15 minutes

C

10 minutes

D

5 minutes

Text Solution

Verified by Experts

The correct Answer is:
B
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MCGROW HILL PUBLICATION-HEIGHTS AND DISTANCES -MULTIPLE CHOICE QUESTIONS
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  2. The upper part of a tree, broken by the wind makes an angle of 60° wit...

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  3. A man on the top of a tower, standing on the seashore, finds that a...

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

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  5. A flag staff of 5m high stands on a building of 25m high. At an obse...

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  6. An aeroplane flying at a height 300 metre above the ground passes vert...

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  7. At a point on level ground, the angle of elevation of a vertical to...

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  8. The straight roads intersect at an angle of 60°. A bus on one road is ...

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  9. A flagstaff 10 m high stands at the centre of a equilateral triangle, ...

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

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  11. From the top of a light house, the angles of depression of two station...

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  12. A flag staff on the top of the tower 80 mt of height subtends an angle...

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  13. An aeroplane flying horizontally 900 m above the ground is observed at...

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  14. From the top of the house 18m high, if the angle of elevation of the t...

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  15. If the angle of elevation of an object from a point 100 m above a lake...

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

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  17. If the angles of elevation of the top of a tower from two points at d...

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  18. A boat is rowed away from a cliff 150 m high. At the top of the cliff,...

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  19. From the top of a church spire 96 m high, the angle of depression of t...

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  20. A flagstaff of height 1/5 of the height of a tower is mounted on the t...

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