
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 boatman, inspecting his section of the river in an ordinary rowing boat, rowed upstream for 12.5 km and then returned to his original place by the same route. In this journey, he covered every 3 km against the current and every 5 km with the current in the same average amount of time, and the total journey took exactly 8 hours. Determine the speed of the current and the time of the boatman's upstream journey.

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