Over longer distances , average traveling speed declines to NUMBER@1 to NUMBER@2 miles per hour -LRB- NUMBER@3 to NUMBER@4 km/h -RRB- .

Racing sled dogs will travel up to an average twenty miles per hour -LRB- NUMBER@5 km/h -RRB- over distances up to NUMBER@6 miles -LRB- NUMBER@7 km -RRB- . Sled dogs have been known to travel over NUMBER@8 miles in a NUMBER@9 hour period while pulling NUMBER@10 pounds each .
