
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
There are two docks located one kilometer before the convergence of two river branches, and another dock is situated two kilometers after the convergence (see the illustration).

A boat traveled from one dock to another (it is unknown which) in 30 minutes and from the second dock to the third in 18 minutes. How many minutes will it take the boat to travel from the third dock back to the first dock? The speed of the river current is constant and the same throughout 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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