Table: rowing at the 2008 summer olympics - men 's lightweight coxless four
Question: What is the average time of the top three countries in the men's lightweight coxless four rowing event? 
Step 1 (Operation, Grouping): rank
Step 2 (Operation, Indexing): time
Step 3 (Reasoning, Temporal Reasoning): time, average time
Step 4 (Reasoning, Aggregating): AVG, time
Answer: 6:07.25