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      Question

      An aeroplane flying horizontally at a height of 3 Km.

      above the ground is observed at a certain point on earth to subtend an angle of 60°. After 15 sec flight, its angle of elevation is changed to 30°. The speed of the aeroplane (taking √3 = 1.732) is
      A 230.63 m/sec Correct Answer Incorrect Answer
      B 230.93 m/sec Correct Answer Incorrect Answer
      C 235.85 m/sec Correct Answer Incorrect Answer
      D 236.25 m/sec Correct Answer Incorrect Answer

      Solution

      The correct answer is B

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