Answer:
approximately 38.89 m/s.
Step-by-step explanation:
To calculate the average speed, you can use the formula:
Average Speed = Distance / Time
Given:
Distance = 28 km
Time = 12 minutes = 12/60 hours = 0.2 hours
Now, plug in the values:
Average Speed = 28 km / 0.2 hours = 140 km/h
To convert the average speed from km/h to m/s, you can use the conversion factor: 1 km = 1000 m and 1 hour = 3600 seconds.
Average Speed = (140 km/h) * (1000 m/km) / (3600 s/h) ≈ 38.89 m/s