What was the average speed if the race was 13 hours 35 minutes and 18 seconds?

To calculate the average speed, you need to know the total distance of the race. However, if we only have the time of 13 hours, 35 minutes, and 18 seconds, we can convert it to hours. This is approximately 13.588 hours (13 + 35/60 + 18/3600). Without the distance, we cannot determine the average speed; it is typically calculated as speed = distance/time.