
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
Mary lives 1.5 km away from her school. It takes her 45 minutes to walk uphill from her home to school, and 15 minutes to return downhill along the same route. What is her average speed, in km/hr, for the round trip?

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