Final answer:
The average speed of the high school bus is 40 km/h.
Step-by-step explanation:
To find the average speed of the high school bus, we divide the total distance traveled by the total time taken. In this case, the bus traveled 240 km in 6.0 hours:
Average Speed = Total Distance / Total Time = 240 km / 6.0 h = 40 km/h
So, the average speed of the high school bus for the trip is 40 km/h.