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Time is defined operationally to be that which is measured by clocks. The SI unit of time is the second, which is defined to be "the duration of $9, 192, 631, 770$ periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium $133$ atom."

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Reality of speed and time [closed]

How does a faster object takes less time for the same distance? … For the same distance the first car takes half the time of the second car. This means the time pass half the slower car, how? …
majid dadmand's user avatar