
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
Points A and B move clockwise on the sides of a square with a side length of 100m. The speed of A is 5m/s, and the speed of B is 10m/s. A starts from point A, and B starts from the midpoint of side CD. After how many seconds will A and B be on the same side for the first time?

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