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Home Aptitude Height and Distance See What Others Are Saying!
  • Question
  • Two ships are sailing in the sea on the two sides of a lighthouse. The angle of elevation of the top of the lighthouse is observed from the ships are 30° and 45° respectively. If the lighthouse is 100 m high, the distance between the two ships is:


  • Options
  • A. 173 m
  • B. 200 m
  • C. 273 m
  • D. 300 m

  • Correct Answer
  • 273 m 

    Explanation
    Let AB be the lighthouse and C and D be the positions of the ships.

    Two ships are sailing in the sea on the two sides of a lighthouse. The angle of elevation of the top

    Then, AB = 100 m, ∠ACB = 30° and ∠ADB = 45°.

    AB = tan 30° = 1     ⟹     AC = AB x √3 = 100√3 m.
    AC √3

    AB = tan 45° = 1     ⟹     AD = AB = 100 m.
    AD

    ∴ CD = (AC + AD) = (100√3 + 100) m
    = 100(√3 + 1)
    = (100 x 2.73) m
    = 273 m.

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    • Options
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    • Options
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