R2B.8 A firecracker explodes 30 km away from an observer sitting next to a certain clock A. The light from the firecracker explosion reaches the observer at exactly t = 0 according to clock A. Suppose the firecracker's flash illuminates the face of another clock B that is sitting next to the firecracker. What time will clock B register at the moment of illumination if it is correctly synchronized with clock A? Please draw a model and answer in milliseconds.

R2B.8 A firecracker explodes 30 km away from an observer sitting next to a certain clock A. The light from the firecracker explosion reaches the observer at exactly t = 0 according to clock A. Suppose the firecracker's flash illuminates the face of another clock B that is sitting next to the firecracker. What time will clock B register at the moment of illumination if it is correctly synchronized with clock A? Please draw a model and answer in milliseconds.

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