Observer S detects two flashes of light. A big flash occurs at Xl = 1200 m and, 5.00 fLs later, a small flash occurs at X2 = 4S0 m. As detected by observer S', the two flashes occur at a single coordinate x'.
(a) What is the speed parameter of S'.
(b) Is S' moving in the positive or negative direction of the x axis? To S'.
(c) Which flash occurs first and (d) what is the time interval between the flashes?