1 mph = 1.6 kmh
40 mph x 1.6 = 64 k's 64.36 km/h, You should multiply miles per 1.609 mts. One mile=1609 meters
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130 km per hour = 80.7783 mph
3 mph = 4.8 km per hour
62.14 mph
1 mph = 1.609344 kph378/1.609344 = 235 mph
80 km/h = 49.70969538 mph