Km and days do not correlate.
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To convert kilometers to days, you would need to know the speed at which you are traveling. Without knowing the speed, it is impossible to determine the number of days it would take to travel a distance of 900,000,000 km.
That is 601.89 km
147,570 km²
it takes 96.7AU (9 billion miles or 14 billion km)
There are 6,000,000 mm in 6 km.
There are 250,000 mm in 0.25 km.