CBSE Class 10 Maths (Standard) 2016 · Paper 30/1/1 · Question 26

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 $45^{\circ }$. 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 $30^{\circ }$. Find the speed of flying of the bird. (Take $\sqrt{3}=1.732$)