An observer on Earth watches a spaceship moving with a velocity of 0

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An observer on Earth watches a spaceship moving with a velocity of 0.600 c. What time interval will this observer measure with his clock for each second measured by the spaceship clock?

1. 1.67 s
2. 0.800 s
3. 1.25 s
4. 0.600 s
5. 1.00 s