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## Homework Statement

Mavis boards a spaceship and zips Stanley on earth a constant speed of 0.600c at the instant mavis passes, both start timers.

At the instant mavis reads 0.400 s on her timer, what does Stanley read on his?

## Homework Equations

## The Attempt at a Solution

since time from an stationary observer = gamma proper time, so the dilated time is 0.400s/the gamma factor which gives 1/2, why is this wrong?