
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 passenger ship travels at a speed of 26 km/h in still water between ports A and B. The river's current speed is 6 km/h. If the ship makes 4 round trips between ports A and B in a total of 13 hours (excluding the time for the ship to turn around), what is the distance between ports A and B in kilometers?

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