
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
A person walked for 5 hours, first along a flat road, then up a mountain, and finally returned along the same route. If his speed on the flat road was 4 li per hour, going up the mountain was 3 li per hour, and going down the mountain was 6 li per hour, then his average speed from departure to return to the original place was ____ li per hour.

Present the answer in LaTex format: \boxed{Your answer}
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