
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
During a mine blast, to ensure safety, after lighting the fuse, one must move to a safe area more than 400 meters away before the explosion. The burning speed of the fuse is 1 meter per second, and the speed of a person moving away is 5 meters per second. The fuse must be at least ______ meters long.

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