
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
The distance between cities A and B is 450 kilometers. Two cars start from city A to city B at the same time. The first car travels at 45 kilometers per hour, and the second car travels at 30 kilometers per hour. After the first car arrives at city B, it immediately returns. How many hours in total did it take for the two cars to meet from the start?

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