1 km is a measure of distance, not speed. On the other hand, miles per hour is a measure of speed not distance. So there is a basic fault in the question.
1 km = 0.621 miles
and 1 km PER HOUR = 0.621 miles per hour
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1 kilometer = 0.621371192 miles
127.38109440865345 Miles per Hour
11.7 feet per second. ------------------------------ Of course, there are many other possible answers to this question, for instance, (8miles/hour)(1km/0.62mi) = (8/0.62)km/h = 12.9km/h. Notice that 1km = 0.62mi, and (1km/0.62mi) = 1. This approach is the key to all unit conversions, since when you multiply by 1, the quantity (speed) doesn't change.
The man is approximately running at 9.3205679 mph.
657.0950374 miles per hour