The car traveled 100 km in 1 hour, and then another 300 km in 4 hours. What is the average speed along the way?

The average speed is calculated based on the value of the distance traveled and the total time spent on its overcoming (despite the fact that different sections of it can be traversed at different speeds).

Let’s find the common path that our car drove: 100 km + 300 km = 400 km.

Let’s find the total time spent on the passage of this path: 1 hour + 4 hours = 5 hours.

Now let’s calculate the average speed of the car: 400 km / 5 hours = 80 km / h.