Q:

An observer on the top of a mountain, 500 m above the sea level, observes the angles of depression of the two boats in his same place vision to be 45 ° and 30 ° respectively. Then the distance between the boats, if the boats are on the same side of the mountain, is 

• 1
  366 m
• 2
  699 m
• 3
  456 m
• 4
  584 m