
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
Henry went for a countryside walk sometime between 8 and 9 in the morning when the hands of his clock were aligned. He arrived at his destination between 2 and 3 in the afternoon, at which time the hands of his clock were pointing in exactly opposite directions. How long did Henry's walk last?

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