
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
At 12:00 noon, Anna and Bill walked in the same direction. Anna walked at 4 km/h and Bill walked at 3 km/h. At 12:15, Dexter, running at 6 km/h, left home to run after them. The dog ran until it caught up to Anna, then ran back to Bill. Determine the time when Bill met Dexter on Dexter's return.

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