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A harbour lies in a direction 60^@ south...

A harbour lies in a direction `60^@` south - west from a fort and at a distance 30 km from it .A ship sets from the habour at noon and sails due east at 10 km / hour .The ship will be 70 km from the fort at

A

7 P.M.

B

8 P.M.

C

5 P.M.

D

10 P.M.

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The correct Answer is:
B
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FIITJEE-HEIGHTS & DISTANCE -ASSIGNMENT PROBLEMS (OBJECTIVE) LEVEL-I
  1. From a light-house L two ships P and Q are observed in direction south...

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  2. A harbour lies in a direction 60^@ south - west from a fort and at a d...

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  3. From the top of a lighthouse 60 meters high with its base at the sea l...

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  4. An isosceles triangle of wood is placed in a vertical plane, vertex up...

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  5. A flagstaff of length l is fixed on the top of a tower of height h. Th...

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  6. A pole of height h stands at one corner of a park of the shape of an e...

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  7. A pole 25 meters long stands on the top of a tower 225 meters high. It...

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  8. Each side of a square substends an angle of 60^@ at the top of a towe...

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  9. A person standing on the ground observes the angle of elevation of th...

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  10. The angle of elevation of the top of a tower from the top and bottom o...

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  11. If a flag staff subtends the same angles at the points A,B,C and D on ...

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  12. A pole of 50 meter high stands on a building 250 m high. To an observe...

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  13. The electric pole subtends an angle of 30^(@) at a point on the same l...

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  14. A person walking along a straight road observes that a two points 1 km...

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  15. A man standing on a level plane observes theanlge of elevation of top ...

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  16. Two pillars of height a and b subtend the same angle alpha at a point ...

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  17. From the top of aspier the angle of depression of the top and bottom o...

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  18. ABC is a triangular park in the form of an equilateral triangle. A pil...

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  19. A chimeny of 20 m height standing on the top of a building subtends an...

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  20. A flag leaning to wards the east is inclined at an angle theta to the ...

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