
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 now lives 1.5 km from her school. It takes her 45 minutes to walk uphill to school against the wind, but it takes her only 15 minutes to walk back home with the wind 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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