Table: swimming at the 2007 world aquatics championships - men 's 50 metre butterfly
Question: What was the average time difference between the fastest and slowest swimmers in the men's 50m butterfly heats at the 2007 World Aquatics Championships?
Step 1 (Operation, Indexing): time
Step 2 (Reasoning, Aggregating): MAX, time
Step 3 (Reasoning, Aggregating): MIN, time
Step 4 (Reasoning, Arithmetic): -, time difference
Answer: 1.17