Final answer:
Two rates that can be found from Marcus's walkathon information are the percentage of runners who ran at speeds of 7.5 miles per hour or less (slower) and the percentage of runners who ran at speeds of 7.5 miles per hour or more (faster).
Step-by-step explanation:
In Marcus's walkathon information, two rates that can be found are the percentage of runners who ran at speeds of 7.5 miles per hour or less (slower) and the percentage of runners who ran at speeds of 7.5 miles per hour or more (faster). According to the information given, 40% of runners ran at speeds of 7.5 miles per hour or less, while 60% of runners ran at speeds of 7.5 miles per hour or more. These rates represent the proportion of runners in each category.
Two rates that can be calculated from the given walkathon information are the average speed of Marcus's walk and the percentage of runners with certain speeds.