Task: Text to Code
Input (English): SQL: SELECT T2.Name , Avg ( T1.Speed ) FROM roller_coaster AS T1 JOIN country AS T2 ON T1.Country_ID = T2.Country_ID GROUP BY T1.Country_ID
Feedback: Find country's name in place of country id in step 2.
Output (English): SELECT T1.Name ,  avg(T2.Speed) FROM country AS T1 JOIN roller_coaster AS T2 ON T1.Country_ID  =  T2.Country_ID GROUP BY T1.Name