1 mile = 1.609344 kilometer
70 miles = 112.65 kilometers (rounded)
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roughly MPH X 1.609
You multiply mph by 1.60934. Therefore, 80 mph = 80 x 1.60934 = 129 (128.7472) km per hour.
5,795 kilometers per second = 12,963,050 miles per hour (rounded)
Answer: 42 mph = 67.5924 km/h
km/sec x 2,236.94 = mph