Final answer:
Joe would need to run for 15 days in order to meet his goal of running at least 60 miles before the marathon.
Step-by-step explanation:
To find out how many days Joe would need to run in order to meet his goal of at least 60 miles, we can divide the total mileage by his daily mileage. Joe plans to run 4 miles every day, so we divide 60 by 4 to get the number of days he needs to run.
60 miles ÷ 4 miles/day = 15 days
Therefore, Joe would need to run for 15 days in order to meet his goal of running at least 60 miles before the marathon.