In a mechanical coal-washing process, a portion of the inorganic sulfur and ash material in the mined coal can be removed. A feed stream to the process consists of 73% coal, 11% ash, 11% sulfur, and 5% water (to suppress dust). The clean coal side of the process consists of 88% coal, 6% sulfur, 3% ash, and 3% water. The refuse side consists of 32% sulfur, with the remainder being ash, coal, and water. If 80.0 metric tons per hour of clean coal is required, determine the feed rate required for th