
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
A boat has a speed of $12$ mph in still water. In a stream that has a current of $3$ mph, it travels a distance of $18$ miles downstream and returns. However, during the upstream journey, it takes a 30-minute break. Calculate the ratio of the average speed for the round trip to the speed in still water.
A) 0.75  
B) 0.80  
C) 0.81  
D) 0.85  
E) 0.90

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