Half of the time of movement from one city to another, the car moved at a speed of 60 km / h.

Half of the time of movement from one city to another, the car moved at a speed of 60 km / h. At what speed did he move in the second half of his journey, if the average speed of the car is 65 km / h?

Initial data: V1 (vehicle speed in the first half of the time) = 60 km / h; V (average vehicle speed along the entire path) = 65 km / h.
Since the travel time on the two sections of the path is the same, the speed of the car for the second half of the time can be determined from the formula: V = (V1 + V2) / 2, whence V2 = 2V – V1.
Let’s calculate: V2 = 2 * 65 – 60 = 130 – 60 = 70 km / h.
Answer: In the second half of the driving time, the car was driving at a speed of 70 km / h.