The car drove the distance between the two cities for 6 hours at a speed of 80 km / h.

The car drove the distance between the two cities for 6 hours at a speed of 80 km / h. She traveled back in 8 hours. How much has its speed decreased?

To solve the problem, you first need to determine the distance between two cities.

To do this, we multiply the known value of the vehicle speed by the travel time.

We get:

80 * 6 = 480 km.

We find the speed of the car on the way back.

To do this, we divide the distance between cities by the travel time.

We get:

480/8 = 60 km / h.

Find the difference in vehicle speed on the way back.

80 – 60 = 20 km / h.

Answer:

The speed of the car on the way back decreased by 20 km / h.