
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
Emily runs parallel to a riverbank, overtaking a train moving at a constant but slower speed. She counts **300** steps running from the back of the train to the front and then, while running in the opposite direction, counts **90** steps of the same size from the front to the back. In terms of Emily's equal steps, what is the length of the train?
A) 180
B) 190
C) 200
D) 210
E) 220

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