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Q:

An Aeroplan is flying horizontally at a height of 1.8 km above the ground. The angle of elevation of plane from point X is 60° and after 20 seconds, its angle of elevation from X becomes 30°, If point X is on ground, then what is the speed (in km / hr.) of Aeroplan? 

  • 1
    201√3
  • 2
    305√3
  • 3
    216√3
  • 4
    105√3
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Answer : 3. "216√3 "

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