
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
To exercise, Rongrong rides a bike to the library every Sunday. The library is 15 kilometers away from Rongrong's home. On the same route, the speed of taking a car is 4 times the speed of riding a bike. Therefore, Rongrong needs to leave 45 minutes earlier than taking a car in order to arrive at the library at the same time. Find the speed at which Rongrong rides the bike.

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