The car drove from A to B at some constant speed, and returned at a speed of 54 km / h.

The car drove from A to B at some constant speed, and returned at a speed of 54 km / h. With what speed did he go from A to B if the average speed was 60 km / h.

The average speed of movement is closely related to the concept of arithmetic mean. The car does not travel at a constant speed on all parts of the path, therefore, the average speed of movement is calculated. Knowing that the car was traveling from point A to point B at a certain constant speed, and driving back at a different constant speed, you can find the average speed of the car. To do this, you need to add two speeds and divide by 2 – this will be the average speed of movement.

In this problem, the average speed of movement and the speed of movement from B to A are known. So, in order to find the speed of the car from A to B, it is necessary to multiply the average speed of movement by 2 and subtract the speed from B to A, that is:

60 * 2 – 54 = 120 – 54 = 66 (km / h).

Answer: the speed of the car moving from A to B is 66 km / h.