
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

Alena has a mobile phone whose battery lasts for 6 hours of talk time or 210 hours of standby time. When Alena boarded the train, the phone was fully charged, and when she got off the train, the phone battery was drained. How long was her train journey, if she talked on the phone for exactly half the duration of the trip?

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