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Homework Statement
In a certain frame S, two events A and B are separated spatially by 3ly with A occurring 1 year before B. What must be the relative speed of a frame S' such that the two events occur simultaneously?
Homework Equations
The Attempt at a Solution
Don't I just use: dt' = gamma(dt-B/c dx)
but when i put in dt = 1 and dx = 3 i get to gamma = 3B/c which i can't solve! am i doing it right?