
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 boy named Tolya loves to swim. When he visits his grandmother's dacha, he swims in the Volkhov River, going downstream from one beach to another in 18 minutes. It takes him exactly 1 hour to swim back upstream. When he visits another grandmother's dacha, he swims the same distance downstream in the Luga River in 20 minutes. How much time will it take him to swim back upstream?

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