
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 swimmer is swimming upstream against the current of the Neva River. Near the Palace Bridge, he lost an empty flask. After swimming upstream for another 20 minutes, he noticed the loss and turned back to catch the flask; he caught it near the Lieutenant Schmidt Bridge. What is the speed of the current of the Neva River if the distance between the bridges is 2 km?

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