
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
The road from point \( A \) to point \( B \), which is 11.5 km long, goes uphill first, then on flat terrain, and finally downhill. A pedestrian took 2 hours and 54 minutes to travel from \( A \) to \( B \), and 3 hours and 6 minutes for the return journey. The pedestrian's walking speed was 3 km/h uphill, 4 km/h on flat terrain, and 5 km/h downhill. How many kilometers of the road are on flat terrain?

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