5 or 6; perhaps up to 8 or so if you walk rather quickly.
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It is travelling at a speed of 7.317072 kilometres per hour. It could be a person brisk walking or jogging at a very slow speed. It could also be a person getting dragged while walking his dog.
70
A fighter jet.
Assuming the runner maintains his average speed for an hour, 3 kilometres in 30 minutes is equal to 6 kilometres per hour.
Kilograms are weights not a unit of speed. If you mean mph to kilometres per hour then 100 mph = 160.9344 kph