
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
Colonel Crackham claims that his friend, Mr. Wilkinson, goes from his country house to the nearest town at a speed of 5 km/h, and returns a bit tired, covering the same distance at a speed of 3 km/h. The round trip takes him exactly 7 hours.

How far from the city is Mr. Wilkinson's house?

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