Question of chapter applications of trigonometry

Question

A bird is sitting on the top of a 80 m high tree. From a point on the ground, the angle of elevation of the bird is 45°. The bird flies away horizontally in such a way that it remained at a constant height from the ground. After 2 seconds, the angle of elevation of the bird from the same point is 30°. Find the speed of flying of the bird. (Take 3 =1.732)

Answer 1

Draw and label a diagram!!!

The horizontal distance of the bird from the view point is 40√3 meters.(See the 30-60-90 triangle?)

The bird flew 80 - 40√3 m/sec