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100,000 km per what time unit?
Sometimes Earth is close to Mars, when it's making a pass, and other times it's far away, at the other side of the track. The minimum distance from the Earth to Mars is about 54.6 million kilometers. The farthest apart they can be is about 401 million km. The average distance is about 225 million km.
Assume that a spacecraft can travel at the speed of 100,000 km, how many days will it take to get from Earth to Mars?
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