Two frames of reference A and B are in standard configuration with the origin of frame B moving along the x-axis of frame A at speed V, as measured in reference A. An observer in frame A detects an event with spatial coordinates: x1 = 10 × 108 m, y1 = 0 m, z1 = 0 m. After 3 seconds another event is detected in frame A, with spatial coordinates: x2 = 20 × 108 m, y2 = 0 m, z2 = 0 m. An observer in the frame of reference B observes the events happening simultaneously. What is the relative speed of the frames?

Two frames of reference A and B are in standard configuration with the origin of frame B moving along the x-axis of frame A at speed V, as measured in reference A. An observer in frame A detects an event with spatial coordinates: x1 = 10 × 108 m, y1 = 0 m, z1 = 0 m. After 3 seconds another event is detected in frame A, with spatial coordinates: x2 = 20 × 108 m, y2 = 0 m, z2 = 0 m. An observer in the frame of reference B observes the events happening simultaneously. What is the relative speed of the frames?

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