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Explain what would happen if the truck were able to maintain a constant speed over 250km/h?

Is it reasonable to assume a constant speed for such a trip?

(Find 2 sources)

What factors affect the reasonableness of the model the most?

Suppose that, for every extra freight container the truck carries, the fuel efficiency drops by 0.05km/L. Suggest what will happen to the optimum travelling speed as the load of the truck’s freight increases.

Find a mathematical relationship between freight size and speed for which cost is a minimum. Discuss your findings.

I've figured out the cost model C= 1375*(801-2.96x)(x(18-0.1x)) (x is speed, C is total cost)