
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
It takes one minute for a train traveling at constant speed to pass completely through a tunnel that is 120 meters long. The same train, traveling at the same constant speed, takes 20 seconds from the instant its front enters the tunnel to be completely inside the tunnel. How long is the train?

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