
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 certain boat travels downstream for $3$ hours and upstream for $2$ hours. The speed of the boat in still water is $a$ km/h, and the speed of the water current is $b$ km/h $(a > b)$. The boat travels ______ kilometers more downstream than upstream.

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