Rear view mirrors

Rear view mirrors in automobiles are generally convex. Suppose a car A moves with a constant speed of 40.0 kilometre per hour on a straight level road and is followed by another car B moving with the constant speed 60.0 kilometre per hour. At a given instant of time, we denote: x : distance of the car B from the mirror of car A, y : distance of the car B from A as seen by the driver of A in the mirror, vx : speed of approach of B relative to A and vy : speed of approach of B as seen in the mirror of A. FIND: If R = 2.0 m, what is the speed of approach of B in kilometre per hour as seen by the driver of A in the mirror of x= 2.0m. FIND ANSWER IN Km/hr NOTE: THIS QUESTION IS FROM INDIAN NATIONAL PHYSICS OLYMPIAD 2012

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