
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 column of cars, moving uniformly at the same speed, has a length of $5 \mathrm{km}$. In the last car is the head of the column, next to whom is a motorcyclist. On the orders of the leader, the motorcyclist increased his speed, caught up with the front car, delivered a package, immediately turned around and, with the same speed with which he went forward, went back to his place. While the motorcyclist completed the task, the column moved forward by 5 km. How many kilometers did the motorcyclist travel?

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