
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
In Sweden, it is said that there is a very deep chasm or cave, such that if a stone is dropped into it, the sound of the impact is only heard after 25 seconds. How deep is the cave, taking into account the propagation speed of sound?

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