Question: The cost per hour for fuel to run a train is v2/4 dollars, where v is the speed of the train in miles per hour.

The cost per hour for fuel to run a train is v2/4 dollars, where v is the speed of the train in miles per hour. Other costs, including labor, are $300 per hour. How fast should the train travel on a 360-mile trip to minimize the total cost for the trip?

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