During the labor day weekend, amy and kathleen each ran in a race. amy ran in a 5k and completed it in 31 minutes and 15 seconds. kathleen ran in a half-marathon, which is 21.1 kilometers, and completed it in 2 hours, 11 minutes, and 52.5 seconds.
let d represent distance in kilometers, r represent the rate, and t represent time in minutes. the proportional relationship