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Image of an object approaching a convex ...

Image of an object approaching a convex mirror of radius of curvature 20m slong its optical axis is observed to move from `(25)/(3)`m to `(50)/(7)`m in 30 seconds. What is the speed of the object in km per hour?

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The correct Answer is:
3
For `v_(1)=50//7m, u_(1)=-25m, v_(2)=25//3m, n_(2)=-50m`
Speed of object `=(25)/(30)xx(18)/(3)=3kmh^(-1)`
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