Answer:
The average speed is 9 km per hour
Step-by-step explanation:
Average speed = total distance ÷ total time
Let us use this rule to solve the question
∵ Johnnie runs 4.5 km every day
∴ The total distance = 4.5 km
∵ It takes him 30 minutes to run his route
∴ Total time = 30 minutes
→ We need to change the time to hours to find the average speed in km/h
∵ 1 hour = 60 minutes
→ Divide the time by 60 to change it from minutes to hours
∴ Total time = 30/60 = 0.5 hour
∵ Average speed = distance ÷ time
∴ Average speed = 4.5 ÷ 0.5
∴ Average speed = 9 km/h
∴ The average speed is 9 km per hour
