The train went 3 hours at a speed of 65.2 km / h and 2 hours at a speed of 83.3 km / h. Find the average train speed for these 5 hours?

Let’s divide the path into 5 sections by the hour:
In the first hour, the train was traveling at a speed of 65.2 km / h
In the second hour, the train was traveling at a speed of 65.2 km / h
In the third hour, the train was traveling at a speed of 65.2 km / h
In the fourth hour, the train was traveling at a speed of 83.3 km / h
At the fifth hour, the train was traveling at a speed of 83.3 km / h
To find the average speed, add up all speeds in all sections and divide by the number of sections:
Vav. = (65.2 + 65.2 + 65.2 + 83.3 + 83.3): 5 = 362.2: 5 = 72.44 (km / h) – the average speed for these 5 hours.
Answer: 72.44 km / h