
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
After speeding up, a train departs from City A at 21:00 and arrives on time in City B at 07:00 the next day. The travel time is reduced by 2 hours compared to before the speed increase, and the average speed is 20 kilometers per hour faster than before. What was the average speed before the speed increase, in kilometers per hour?

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