according to eistein's theory of relativity, relative motion between objects chages the rate at which tims passes. As the relative speed increases, rate at which time passes decreses. Hence, Due to this effect time for an object moving near to spped of light runs slower and for stationary objects runs faster. This is why here time measured in amy's frame of reference (stationary) is more than measured in Briteny's frame of reference (moving).
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