
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
Xiaoming and Xiaogang start walking towards each other from two places 25 kilometers apart at the same time and meet after 3 hours. Xiaoming's speed is 4 kilometers per hour. Let Xiaogang's speed be $x$ kilometers per hour. Formulate an equation to represent the situation.

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