
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
The 555 bus of Wuyang Bus Company travels back and forth between two main stations, A and B, departing every $x$ minutes. Xiao Hong rides his bicycle on the street and notices that a 555 bus passes him from behind every 6 minutes, and a 555 bus comes towards him every 3 minutes. Assuming the speed of the bus and Xiao Hong's cycling are constant and ignoring the time spent at stops, then $x = \boxed{4}$ minutes.

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