Question: An experimenter arranges to trigger two flashbulbs simultaneously, producing a big flash located at the origin of his reference frame and a small flash at

An experimenter arranges to trigger two flashbulbs simultaneously, producing a big flash located at the origin of his reference frame and a small flash at x = 30.0 km. An observer moving at a speed of 0.250c in the positive direction of x also views the flashes.
(a) What is the time interval between them according to her?
(b) Which flash does she say occurs first?

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