
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 tourist sets out on a hike from point $A$ to point $B$ and back, covering the entire distance in 3 hours and 41 minutes. The journey from $A$ to $B$ initially ascends uphill, then travels on flat terrain, and finally descends downhill. Determine the distance over which the road runs on flat terrain, given that the tourist's speed is 4 km/h uphill, 5 km/h on flat terrain, and 6 km/h downhill, with the total distance from $A$ to $B$ being 9 kilometers.

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