
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 journey from $A$ to $B$ consists of 3 km uphill, 6 km downhill, and 12 km on flat ground. The motorcyclist completed this journey in 1 hour and 7 minutes and the reverse journey in 1 hour and 16 minutes. Find the motorcyclist's speed uphill and speed downhill, given that his speed on flat ground was 18 km/h. (Note that the motorcyclist traveled at constant speeds both uphill and downhill on both the $A$ to $B$ and the reverse routes.)

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