Answer:
The man's speed is 42.5 km/h.
You can find this by dividing the distance he traveled (255 km) by the time it took him to travel that distance (6 hours).
255 km / 6 hours = 42.5 km/h.
The formula to find speed is:
Speed = Distance / Time
In this case, the distance is 255 km and the time is 6 hours. So using the formula, we can calculate the speed as:
Speed = 255 km / 6 hours = 42.5 km/h
So the man's speed is 42.5 km/h.