A high-walled arena has a radius of 20 meters. Point O being the center, point A is along the circumference, while Bis 10 meters from point O. Points A, O and B lie on the same diameter. A light is located in the ground at point A. A boy from B runs towards point Cat the rate of 3 meters per second. How fast is the boy's shadow moves along the wall when the boy is halfway toward C? shadow Radius = 20 m

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