
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
Two ships depart from the same port in opposite directions at the same time. Ship A sails with the current while ship B sails against the current. The speed of both ships in still water is $50$ kilometers per hour. The speed of the water current is $a$ kilometers per hour. After $2$ hours, ship A sails ______ kilometers farther than ship B.

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