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the operating cost of a truck is 12+x/6 cents per mile when the truck travels x miles per hour.

the operating cost of a truck is 12+x/6 cents per mile when the truck travels x miles per hour. If the driver earns $6 per hour, what is the most economical speed to operate the truck on a 400 mile turnpike? Due to construction, the truck can only travel betweeen 35 and 60 miles per hour

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