In the first hour, the car traveled 12 km more than in the second hour, and in the third hour, 7 km less than in the first hour

In the first hour, the car traveled 12 km more than in the second hour, and in the third hour, 7 km less than in the first hour. How many kilometers did the car drive in the first hour if it covered 236 km in three hours?

Let the car have driven x kilometers in the first hour. Then in the second hour he drove x-12 kilometers, and in the third x-7 kilometers.

Then the car drove in total x + x – 12 + x – 7, and according to the problem statement, this is 236 km.

x + x – 12 + x – 7 = 236;
3x-19 = 236;
3x = 236 + 19;
3x = 255;
x = 85.

Answer: in the first hour, the car drove 85 kilometers.