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Home Aptitude Height and Distance See What Others Are Saying!
  • Question
  • The angles of depression of two ships from the top of a light house are 45° and 30° towards east. if the ships are 200 m apart, find the height of the light house .


  • Options
  • A. 100 m
  • B. 173 m
  • C. 200 m
  • D. 273 m

  • Correct Answer
  • 273 m 

    Explanation

    Let us draw a figure below as per given question.
    Let AB = h meter be the height of the tower and two ships are situated at D and C respectively; such that, CD = 200 m; ?ADC = 30° ?ACB = 45° and BC = x meter (say)
    Now from right triangle ABC,
    tan 45° = h/x ? 1 = h/x
    ? x = h
    Again from right triangle ABD,
    tan 30° = h/( 200 + x )
    ? 1/?3 = h/( 200 + x )
    Since x = h , we will get.
    ? 1/?3 = h/(200 + h )
    ? (200 + h ) = h X ?3
    ? h X ?3 - h = 200
    ? h x 1.732 - h = 200
    ? h(1.732 - 1) = 200
    ? h = 200/0.732 = 273.2 m = 273 m


  • More questions

    • 1. 
      Find the present worth of a bill of Rs. 2420 due 2 years later at 10% compound interest. Also find the true discount?

    • Options
    • A. Rs. 2000, Rs. 420
    • B. Rs. 2200, Rs. 520
    • C. Rs. 2100, Rs. 460
    • D. None of these
    • Discuss
    • 2. In the following question, four groups of three numbers are given. In each group the second and third number are related to the first number by a Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

    • Options
    • A. (9, 11, 14)
    • B. (13, 15, 18)
    • C. (17, 19, 22)
    • D. (21, 23, 28)
    • Discuss
    • 3. Find the odd word/letters/numbers pair from the given alternatives.

    • Options
    • A. 41 - 72
    • B. 12 - 30
    • C. 51 - 42
    • D. 11 - 20
    • Discuss
    • 4. Find the odd man out. 253, 136, 352, 324, 631, 244

    • Options
    • A. 324
    • B. 136
    • C. 352
    • D. 631
    • Discuss
    • 5. Select the odd word from the given alternatives.

    • Options
    • A. Stream
    • B. Rivulet
    • C. River
    • D. Valley
    • Discuss
    • 6. Select the odd word from the given alternatives.

    • Options
    • A. Chair
    • B. Sofa
    • C. Couch
    • D. Television
    • Discuss
    • 7. Find the odd number in the following number series? 24, 4, 13, 41, 151, 640

    • Options
    • A. 4
    • B. 640
    • C. 41
    • D. 13
    • Discuss
    • 8. Find the odd term from the given series of numbers ? 125, 127, 130, 135, 142, 153, 165 ?

    • Options
    • A. 153
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    • Discuss
    • 9. What comes next in this sequence 196, 169, 144, 121, 100, 81, ?

    • Options
    • A. 77
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    • C. 67
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    • Discuss
    • 10. Find out the odd word/letters/number/number pair from the given alternatives.

    • Options
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