A truck driving over a flat interstate at a constant speed of 50 mph gets 4 miles to the gallon. Fuel costs $1.19 per gallon. The truck loses a tenth of a mile per gallon in fuel efficiency for each mile per hour increase in speed. Drivers are paid $27.50 per hour in wages and benefits. Fixed costs for running the truck are $11.33 per hour. A trip of 300 miles is planned. What speed optimizes operating expenses?

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