97.7 kilometres (km) is a measure of distance. It makes no sense to try to convert that into a measure of speed: the distance could be traversed by electromagnetic radiation (light, for example) in less than a third of a millisecond, or more than a year for a slow snail.
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The average speed is 110 km per hour.
15.3333
3 km in 5 min => his average speed is 36 km in 60 min, that is 36 km per hour. Clearly an extremely fast runner and way faster than MY average speed.
The average speed is 140 km/hr
Average speed = 4 km/hr