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The cost costcost of fuel to run a locomotive is proportional to the square of the speed and 25 per hour for a speed of

The cost costcost of fuel to run a locomotive is proportional to the square of the speed and 25 per hour for a speed of 25 miles per hour Other costs costscosts amount to 50 per hour regardless of the speed Find the speed that minimizes the cost costcost per mile

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