
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 car travels the 150 miles from city $A$ to city $B$ at a speed of 50 miles per hour. After reaching city $B$, it returns to city $A$ at a different constant speed. If the average speed for the entire round trip is 40 miles per hour, what is the speed of the car on its return journey from $B$ to $A$?

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