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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?

A

3

B

4

C

5

D

6

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The correct Answer is:
A
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