
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
During the "Eleven" holiday, Xiaoming and his parents drove to a scenic spot 300 km away from home. Before departure, the car's fuel tank contained 60 liters of fuel. When they had driven 100 km, they found that there were 50 liters of fuel left in the tank (assuming that the fuel consumption of the car during the journey is uniform). <br/>$(1)$ The average fuel consumption of the car is ______ $L/km$, and the remaining fuel when driving $x$ km is ______ $L$ (expressed using an algebraic expression with $x$); <br/>$(2)$ How many liters of fuel are left when driving 260 km?

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