
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
Class A and class B students went on a spring outing to a park 15 kilometers away from the school. Both classes set off at the same time. The speed of class A is 1.2 times the speed of class B. Class A arrived half an hour earlier than class B. Express the equation that relates the speed of class B in kilometers per hour, denoted by $x$, to the time difference in hours between the arrival times of class A and class B.

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