The chart shows the mile times for a college runner during a race. In how many total seconds did the runner complete the race?

A chart showing miles and time. Mile 1, 5 minutes 59 seconds. Mile 2, 6 minutes, 20 seconds. Mile 3, 6 minutes 21 seconds.

To find the total time, we add up the times for each mile:

5 minutes 59 seconds + 6 minutes 20 seconds + 6 minutes 21 seconds

To add the minutes, we add 5 + 6 + 6 = 17 minutes.

To add the seconds, we add 59 + 20 + 21 = 100 seconds.

Since there are 60 seconds in a minute, we can convert the extra 100 seconds into 1 minute and 40 seconds.

Adding this to the total minutes, we have:

17 minutes + 1 minute + 40 seconds = 18 minutes 40 seconds.

Therefore, the runner completed the race in a total of 18 minutes and 40 seconds.