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]