
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 boats, Boat A and Boat B, depart from the same port at the same time. Boat A travels downstream while Boat B travels upstream. The speed of both boats in still water is $a km/h$, and the speed of the water flow is $5 km/h$. After $3$ hours, Boat A has traveled ______ kilometers more than Boat B.

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