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JEE Advance 2010
Paper-2
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?
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