I don't think "invented" is a good word in this case. If you want to describe the speed by which something is travelling you unavoidably end up with unit of distance/unit of time. Miles/hour was something that fitted vehicles very well. Yards/second would work, but measuring the distance between cities in yards gives awkward big numbers.
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5,280 feet = 1 mile
It is 1609.344 metres per hour.
1 mile = 1.609344 kilometer 1 mile per hour = 1.609344 kilometer per hour 26.62 miles per hour = 42.841 kilometers per hour (rounded)
1.60934 km per hour
15 miles/hour