Answer:
15 km/h
Explanation:
How many intervals of running and resting are needed to run and rest for 26 minutes?
Running is in parentheses, resting is not.
Each time he runs (6 minutes) and rests (2 minutes), he takes 8 minutes.
Three times this cycle is 24 minutes. He needs 2 more minutes of running to have a total of 26 minutes.
(6) + 2 + (6) + 2 + (6) + 2 + (2)
Add all the numbers in parentheses which are the times of running.
6 + 6 + 6 + 2 = 20
He ran for 20 minutes and rested for 6 minutes.
He ran 5 km in 20 minutes (of running).
speed = distance/time
speed = [5 km / (20 minutes)] × (60 minutes)/(1 hour)
speed = 15 km/h
Answer: 15 km/h