
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 the ferry crossing on the south bank of the Yangtze River, the river flows eastward at a speed of 12.5 km/h, and the speed of the ferry is 25 km/h. If the ferry wants to cross the Yangtze River perpendicularly, then its course should be __________.

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