
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 route from point A to point B consists only of uphill and downhill segments, with a total distance of 21 kilometers. If the uphill speed is 4 km/h and the downhill speed is 6 km/h, and the journey from point A to point B takes 4.25 hours, how long will it take to travel from point B to point A?

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