Q:

The angle of elevation of an aeroplane from a point on the ground is 60°. After flying for 15 second, the angle of elevation changes to 30°. If the Aeroplane is flying at a height of 4500 meter, then what is the speed (in m/s) of aeroplane?

• 1
  $$ {150\sqrt{3}}$$
• 2
  $$ {200\sqrt{3}}$$
• 3
  $$ {100\sqrt{3}}$$
• 4
  $$ {50\sqrt{3}}$$