Image of an object approaching a convex mirror of radius of curvature 20 m along its optical axis is

Question

Image of an object approaching a convex mirror of radius of curvature 20 m along its optical axis is observed to move from $\frac{25}{3} \mathrm{~m}$ to $\frac{50}{7} \mathrm{~m}$ in 30 seconds. What is the speed of the object in km per hour?\

Professor PC Thomas Classes · Answer

(3)\