One third of the way the car moved 60 km / h the rest of the way moved 80 km / h to find the average speed.
| July 21, 2021 | education
Initial data: V1 (vehicle speed when passing the first third of the way (1/3 S)) = 60 km / h; V2 (vehicle speed on the rest of the journey (2/3 S)) = 80 km / h.
The average vehicle speed is determined by the formula: V = S / t = S / (t1 + t2) = S / (S1 / V1 + S2 / V2) = S / (S / 3V1 + 2S / 3V2) = 1 / (1 / 3V1 + 2 / 3V2).
Calculation: V = 1 / (1 / (3 * 60) + 2 / (3 * 80)) = 72 km / h.
Answer: The average vehicle speed is 72 km / h.
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