Divide by 1.609344 or multiply by 0.6214 (approx).
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Use this formula - mph x 1.609 = km/h
Answer: 65 km/h = 40.3891 mph
You multiply mph by 1.60934. Therefore, 80 mph = 80 x 1.60934 = 129 (128.7472) km per hour.
Answer: 42 mph = 67.5924 km/h
km/sec x 2,236.94 = mph