Physics - Geometrical Optics Question with Solution | TestHub

Image of an object approaching a convex mirror of radius of curvature $20\mathrm{m}$ along its optical axis is observed to move from $\frac{25}{3}\mathrm{m}$ to $\frac{50}{7}\mathrm{m}$ in $30\mathrm{s}$. What is the speed of the object in $\mathrm{km}{\mathrm{h}}^{-1}$ ?