A ship uses 5x^2 dollars of fuel per hour when travelling at a speed of x...

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...miles per hour. The other expenses o? A ship uses 5x^2 dollars of fuel per hour when travelling at a speed of x miles per hour. The other expenses of operating the ship amount to $2000 per hour. What minimizes the cost of a 500-mile trip? [Hint: Express cost in terms of speed and time. The constraint equation is distance = speed x time.]