Racing sled dogs will travel up to an average twenty miles per hour -LRB- NUMBER@1 km/h -RRB- over distances up to NUMBER@2 miles -LRB- NUMBER@3 km -RRB- .

Racing sled dogs will travel up to an average twenty miles per hour -LRB- NUMBER@4 km/h -RRB- over distances up to NUMBER@2 miles -LRB- NUMBER@3 km -RRB- . Over longer distances , average traveling speed declines to NUMBER@5 to NUMBER@6 miles per hour -LRB- NUMBER@7 to NUMBER@8 km/h -RRB- .
