
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
Xiao Ming's father needs to first ride a mountain bike for 10 minutes and then take the subway for 40 minutes to get to work every day. One day, the subway broke down, so he directly rode the bike to work, which took a total of 3.5 hours. What is the ratio of the subway's speed to the mountain bike's speed?

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