Image of an object approaching a convex mirror of radius of curvatu...

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