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Q:

A pilot in an aeroplane at an altitude of 200 m observes two points lying on either side of a river. If the angles of depression of the two points be 45 ° and 60 °, then the width of the river is 

  • 1
    400√3m
  • 2
    $${400\over√3}m $$
  • 3
    $$200+{200\over√3}m $$
  • 4
    $$200-{200\over√3}m $$
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Answer : 3. "$$200+{200\over√3}m $$"

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