The car drove 3.2 hours on the highway at 90 km / h, then 1.5 hours on a dirt road at 50 km / h, and finally 0.3 hours

The car drove 3.2 hours on the highway at 90 km / h, then 1.5 hours on a dirt road at 50 km / h, and finally 0.3 hours on a country road at 30 km / h. Find the average speed of the vehicle along the way.

Let’s find the distance that the car has traveled on each section of the road:
1) 3.2 * 90 = 288
2) 1.5 * 50 = 75
3) 0.3 * 30 = 9
4) 288 + 75 + 9 = 372
Find all the time:
3.2 + 1.5 + 0.3 = 5
Let’s find the speed:
372/5 = 74.4
Answer: 74.4