CBSE Class 10 Maths (Basic) 2023 · Paper 430/1/1 · Question 35(b)

An aeroplane when flying at a height of $4000$ m from the ground passes vertically above another aeroplane at an instant when the angles of elevation of the two planes from the same point on the ground are $60^{\circ }$ and $45^{\circ }$ respectively. Find the vertical distance between the aeroplanes at that instant. (Use $\sqrt{3}=1.73$)