
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
A certain supermarket has an average of 60 people lining up to pay per hour. Each cashier can handle 80 people per hour. On a certain day during a specific time period, the supermarket has only one cashier working, and 4 hours after payments start, there are no customers waiting in line. If there were two cashiers working at that time, how many hours after payments start would there be no customers waiting in line?

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