
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
The one-way trip takes 2 hours and 40 minutes, so a round trip takes 5 hours and 20 minutes. Therefore, after a trip, the driver must rest for at least an hour.

Drivers of the first, second, and third trips are named A, B, and C, respectively. Driver A returns to the station at 12:40. At this time, drivers B and C are still en route. Driver A cannot start the next trip before 13:40, so there must be a fourth driver, D, who departs the station at 13:05.

Four drivers are sufficient. Driver A departs on the fifth trip at 16:10, and Driver B, who returned to the station at 16:00, has time to rest and departs on the sixth trip at 17:30.

If Driver A departs on the trip at 17:30, the trip at 16:10 will be left without a driver: Driver B has not yet rested, and drivers C and D are still en route. Thus, Driver A performs the fifth trip at 16:10, and the last trip from 17:30 to 22:50 is performed by Driver B (Driver C is resting, and drivers A and D are en route). Therefore, Ivan Petrovich departed from the station on the second trip, i.e., at 10:40.

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