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re: HSC Physics Marathon Archive Hmm.. not too sure, but: For person A, it would take 25/0.8 = 31.25 years For person B, it would take 25/0.6 = 41.67 years But time also dilates so... using tv = t0 / √(1-v^2/c^2) For A, 25√ (1-(0.8)^2 = 15 years For B, 25√ (1-(0.6)^2 = 20 years Difference...