
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 first travels 420 km downstream and 80 km upstream in 11 hours. The second time, it travels 240 km downstream and 140 km upstream in the same time. How many hours does the boat need to travel 198 km downstream?

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