From the top of a cliff 200m high, the angles of depression of two boats which are due south of observer are 60 degrees and 30 degrees. Find the distance between the two boats.

• For the first boat ,horizontal distance between cliff foot and boat = 200/tan60
  For the second boat,horizontal distance between cliff foot and boat = 200/tan30
  
  => Distance b/w boats = (200/tan30) - (200/tan60) = 231 m
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