Question

In 2018, the winner of the Chicago Marathon ran 26.2 miles in 2 hours, 5 minutes, and 11 seconds. What was his average speed in miles per hour?

Answer 1

The winner ran at an average of 12.39 miles per hour.

Explanation:

In order to find this, we first need to convert the minutes and second into hours. This way we can add them to the 2 hours and then solve. We do this by dividing minutes by 60 and seconds by 360 since those are the unit rates.

5 mins/60 = .083 hours

11 secs/360 = .031 hours

2 + .083 + .031 = 2.114 hours

Now we take our 2.114 hours and divide the miles by that number to get the miles per hour.

26.2 miles / 2.114 hours = 12.39 mph