
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 boat travels upstream from port $A$ and encounters a drifting raft at a distance of 4 kilometers from port $A$. The boat continues its journey to port $B$ upstream and immediately turns around, arriving at port $A$ simultaneously with the raft. Given that the current speed is 2 meters/second, and the boat's speed downstream is 8 meters/second, what is the distance between ports $A$ and $B$ in kilometers?

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