
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
Highways offer great convenience for traveling, but due to the high speeds on highways, accidents often lead to significant loss of life or property. In my country, the maximum speed limit on highways is 120 km/h, while the minimum is 60 km/h.  
(Ⅰ) When a driver is driving at a speed of 120 kilometers per hour and discovers an accident ahead, it takes about 0.9 seconds to react and perform emergency braking. After emergency braking, the vehicle's speed changes according to the formula $v(t) = \frac{100}{3(t+1)} - \frac{5}{3}t$ (where $t$ is in seconds and $v(t)$ is in meters per second) until it comes to a complete stop. Assuming $ln(5)=1.6$, calculate the distance the vehicle travels from the moment the driver spots the accident until the vehicle comes to a complete stop.  
(Ⅱ) During the National Day holiday, tolls are waived for cars on highways. A person drives from Xiangyang to Zengdu, and only needs to pay for fuel. The fuel cost per hour $v$ (in yuan) is related to the speed, following the formula $w = \frac{v^2}{250} + 40$ (where $v$ is in km/h). On the highway, the car must travel within the national speed limits, and it is assumed to move at a constant speed. If the car drives $S$ kilometers on the highway, find the optimum speed $v$ that minimizes the fuel cost for this distance.

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