
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
Two people, A and B, can together complete a batch of parts in 8 hours. If A works alone, it would take 12 hours to complete. After A and B have worked together for $2 \frac{2}{5}$ hours, A is assigned to other work, and B continues producing until 420 more parts are made to complete the task. How many parts did B produce in total?

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