There are 1.609344 kilometres in one mile. Therefore, rounded to two decimal places, 515 kilometres is equal to 515/1.609344 = 320.01 miles.
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1 km = 100,000 cm so 515 km = 515*100,000 = 51,500,000 cm
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500 kilometers = 310.685596 miles
165,000 miles is 265,540 kilometers.
0.8 miles is about 1.3 kilometers.