1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution Hey, I would really appreciate some help with this. I have worked out the Lorentz factor to be 5.025. Am I right to assume that Δx = 200000km, and Δt' = 1.2s and I have to work out Δt and Δx'? If these are correct I have worked out Δt to be 0.8926 and Δx' to be -3.12(*10^8)? It doesn't seem right..