
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
Person A departs from point $A$ to meet person B, traveling 80 kilometers to reach point $B$. At that moment, person B had already left point $B$ for point $C$ half an hour earlier. Person A had been traveling for 2 hours by the time they left point $A$, and then decides to proceed to point $C$ at twice their original speed. After 2 more hours, both A and B arrive at point $C$ simultaneously. What is the speed of person B in kilometers per hour?

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