
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
Three people, Atkins, Brown, and Cranby, decided to go on a small trip. They need to travel a distance of 40 km. Atkins walks at a speed of 1 km/h, Brown at a speed of 2 km/h, and Cranby, riding his cart drawn by a donkey, travels at a speed of 8 km/h. For some time, Cranby carries Atkins, then drops him off to walk the remaining distance. Cranby then returns for Brown and takes him to the final point, with all three arriving simultaneously.

How long did the journey take? Note that during the entire time, the friends moved at a constant speed.

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