One third of the time the car was moving at a speed of 60 km / h, the second third – at a speed of 30 km / h

One third of the time the car was moving at a speed of 60 km / h, the second third – at a speed of 30 km / h, and the rest of the time it was standing. Determine the average vehicle speed in kilometers per hour

Initial data: V1 (vehicle speed in the first third of the driving time) = 60 km / h; V2 (vehicle speed in the second third of the time) = 30 km / h; V3 (vehicle speed for the remaining time) = 0 m / s.

Because the time intervals during which the vehicle speed changed are equal, then its average speed can be determined by the formula: Vav = (V1 + V2 + V3) / 3.

Let’s calculate: Vav = (60 + 30 + 0) / 3 = 90/3 = 30 km / h.

Answer: The car was moving at an average speed of 30 km / h.