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Observer have measured for the car to be filled with gas

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An observer moving toward Earth with a speed of 0.976 c notices that it takes 5.10 min for a person to fill her car with gas. Suppose, instead, that the observer had been moving away from Earth with a speed of 0.799 c. How much time would the observer have measured for the car to be filled in this case?

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The expert examines how observers have measured from the car to be filled with gas.

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Time dilation

We can use the equation for the equation for the time dilation as
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