
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
Keiko walks around a track at varying speeds. The track has straight sides and semicircular ends, with a width of 12 meters. It takes her 60 seconds longer to walk around the outside edge of the track at a speed of 4 meters/second than to walk around the inside edge at a speed of 5 meters/second. Determine Keiko's combined average speed over the entire track in meters per second.
A) 3.0 m/s
B) 3.5 m/s
C) 3.56 m/s
D) 4.0 m/s
E) 4.5 m/s

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