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At the metal-casting company where you work, you must set up a conveyor system to move castings from the furnace to the heat treatment area

At the metal-casting company where you work, you must set up a conveyor system to move castings from the furnace to the heat treatment area 55 yards away. The castings cool at the rate of 0.3F (degrees Fahrenheit) per second and must not be allowed to cool more than 7F before being heat treated. What is the minimum speed, in feet per second, that the conveyor must move?

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