An observer s who lives on the x-axis sees a flash of red light at x = 1210 m, then after 4.96 μs, a flash of blue at x = 480 m. use subscripts r and b to lab

An observer S who lives on the x-axis sees a flash of red light at x = 1210 m, then after 4.96 μs, a flash of blue at x = 480 m. Use subscripts R and B to label the coordinates of the events. (a) What is the velocity relative to S of an observer S’ who records the events as occurring at the same place? (b) What is the measured time interval between these flashes in S’. Use the invariant space-time interval.