
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
On each of the two branches of a river, there is a dock located one kilometer from their confluence, and another dock is located two kilometers downstream from the confluence. A boat traveled from one of the docks to another (it is not known which one) in 30 minutes, and from the second dock to the third one in 18 minutes. How many minutes can it take to travel from the third dock to the first one? (The speed of the river's current is constant and the same in all parts of the river. The boat's own speed is also constant.)

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