
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
Xiaoming's father needs to ride a mountain bike for 10 minutes and then take the subway for 40 minutes to commute to work every day. One day, the subway was broken, so he rode his bike directly to work, which took a total of 3.5 hours. What is the speed of the subway relative to the mountain bike?

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