
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
When Cheenu walked/ran $18$ miles in $4$ hours as a boy and $12$ miles in $5$ hours as an old man, with all walking/running time within daily 6-hour slots, determine the time difference, in minutes, it takes for him to walk a mile now compared to when he was a boy.

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