
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
John walks from home to school with a constant speed, and his sister Joan bikes twice as fast. The distance between their home and school is 3 km. If Joan leaves home 15 minutes after John, then they arrive at school at the same time. What is the walking speed (in km/h) of John?

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