
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
A team is 6km long and moves at a speed of 5km per hour. A messenger rides a horse from the head of the team to the tail to deliver a message, and then returns to the head of the team. The whole journey takes 0.5 hours. What is the speed of the messenger riding the horse, in kilometers per hour?

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