Original: Racing sled dogs will travel up to an average twenty miles per hour (32 km/h) over distances up to 25 miles (40 km).
Simplified: Racing sled dogs will travel up to an average twenty miles per hour (32.2 km/h) over distances up to 25 miles (40 km). Over longer distances, average traveling speed declines to 10 to 14 miles per hour (16 to 22 km/h).