
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
Two hunters set out simultaneously towards each other from two villages, which are 18 km apart. The first hunter walked at a speed of 5 km/h, and the second one at 4 km/h. The first hunter took a dog with him, which ran at a speed of 8 km/h. The dog immediately ran towards the second hunter, met him, barked, turned around, and ran back towards its owner at the same speed, and continued this until the hunters met. How many kilometers did the dog run?

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