An observer sees a big then small flash?

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USCgamecock

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An observer S sees a big flash of light 1600 m from his position and a small flash of light 570 m closer to him directly in line with the big flash. He determines that the time interval between the flashes is 3.69×10-6 s and the big flash occurs first. What is β, the relative velocity divided by the speed of light, of an observer, S' for whom these flashes occur at the same place in the S' reference frame?

B) What time interval between them does S' measure?
 
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