
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 steam locomotive travels a distance of $21 \mathrm{~km}$ from Zalakomár to Kanizsa in 16 minutes. The journey consists of the train uniformly accelerating from rest, then traveling at a constant speed of $90 \frac{\mathrm{km}}{\mathrm{h}}$, and finally uniformly decelerating to a stop. How long does the locomotive travel at the speed of $90 \frac{\mathrm{km}}{\mathrm{h}}$?

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