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Q:

A Navy captain going away from a lighthouse at the speed of 4[(73) -1] m/s. He observes that it takes him 1 minute to change the angle of elevation of the top of the lighthouse from 60 ° to 45 °. What is the height (in meters) of the lighthouse? 

  • 1
    360√3
  • 2
    280√2
  • 3
    240√3
  • 4
    480[(√3)-1]
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Answer : 3. "240√3 "

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