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- .
