I would like to get some help on how to calculate a solution, I was only able to sketch a solution.(adsbygoogle = window.adsbygoogle || []).push({});

Suppose there's two persons. One person in travelling at 0.6c and one is at fixed position. They agree to signal after 1min.

I could only come up with a solution sketching a diagram. First [itex]t_v = \gamma t = \frac{t}{\sqrt{1-\frac{v^2}{c^2}}}= 75s[/itex]

My diagram gave me.

Fixed person gets signal at 120s.

Moving person gets signal at 150s.

I think it's right, but I like to calculate it in a proper way. If anyone could nudge me in the right direction...

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# Sketched solution

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