
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
Alex runs 4 laps around a 500-meter track. For each lap, he runs the first 150 meters at an average speed of 3 meters per second, and the remaining 350 meters at an average speed of 4 meters per second. Determine the time taken by Alex to run the 4 laps.

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