mph is a measure of speed, km is a measure of distance.
Speed = Distance/Time.
You cannot convert distance into speed without knowledge of the time taken for the journey.
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130 km per hour = 80.7783 mph
To make this conversion, first know that 1 km/hour is equal to 0.62 mph. If you multiply this number (0.62) by the number of km you're trying to convert (130), you will get your answer: ~81 mph.
6 mph = 9.6561 km/h
400 km in what time is missing
429.7 km/h