
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
Two cars, Car A and Car B, simultaneously depart from point $A$ to point $B$. At the start, Car A’s speed is 2.5 km/h faster than Car B’s speed. After 10 minutes, Car A slows down; another 5 minutes later, Car B also slows down, and at this time, Car B is 0.5 km/h slower than Car A. After another 25 minutes, both cars arrive at point $B$ at the same time. By how many kilometers per hour did Car A's speed decrease?

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