
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
At a certain point on the bank of a wide and turbulent river, 100 meters away from a bridge, a siren is installed that emits sound signals at regular intervals. Another identical siren was taken by Glafira, who got on a bike and positioned herself at the beginning of the bridge on the same bank. Gavrila got into a motorboat, located on the bank halfway between the first siren and the beginning of the bridge. The experimenters start simultaneously, and the speeds of the bicycle and the motorboat relative to the water are both 20 km/h and directed perpendicular to the bank. It turned out that the sound signals from both sirens reach Gavrila simultaneously. Determine the distance from the starting point where Gavrila will be when he is 40 meters away from the bank. Round your answer to the nearest whole number of meters. The riverbank is straight, and the current speed at each point is directed along the bank.

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