Final answer:
The average velocity of the plane is 72.3 km/h.
Step-by-step explanation:
The average velocity of a plane can be calculated by dividing the total displacement by the total time taken. In this case, the plane traveled 376 km in 5.2 hours.
So, the average velocity of the plane is:
Average Velocity = Total Displacement / Total Time = 376 km / 5.2 hours = 72.3 km/h