His name is synonymous with Hudson County cross country and track and field, and his teams were known statewide. John Nagel’s passion for the sport guided a coaching career that spanned six different decades and included nearly 250 championships and hundreds of loyal runners at St. Dominic Academy of Jersey City, where he coached for the past 46 years. Nagel, 65, died Friday at a hospital in Largo, Florida, a month after falling ill while pursing another of his passions — a baseball spring training trip. “He loved to travel and go to games,” said his daughter, Ashley Nally-Nagel, who accompani…