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Q:

A boat is moving away from an observation tower. It makes an angle of depression of 60 ° with an observer's eye when at a distance of 50 m from the tower. After 8 sec, the angle of depression becomes 30 °. By assuming that it is running in still water, the approximate speed of the boat is 

  • 1
    45 km/h
  • 2
    50 km/h
  • 3
    33 km/h
  • 4
    42 km/h
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Answer : 1. "45 km/h "

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