CBSE Class 10 Maths (Standard) 2019 · Paper 30/5/1 · Question 27(a)

A boy standing on a horizontal plane finds a bird flying at a distance of $100$ m from him at an elevation of $30^{\circ }$. A girl standing on the roof of a $20$ m high building, finds the elevation of the same bird to be $45^{\circ }$. The boy and the girl are on the opposite sides of the bird. Find the distance of the bird from the girl. (Given $\sqrt{2}=1.414$)