
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
Vasya was driving from Sosnovka to Petrovka. Along the way, he saw a sign indicating "70 km to Petrovka". After traveling another 20 km, Vasya saw a sign indicating "130 km to Sosnovka". What is the distance (in kilometers) from Sosnovka to Petrovka? 

Option 1: 140 km
Option 2: 170 km
Option 3: 160 km
Option 4: 180 km

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