What is the average speed of a car on a section of 140 km, if the first half of the time the car was
| January 13, 2021 | education
What is the average speed of a car on a section of 140 km, if the first half of the time the car was traveling at a speed of 50 km / h and the second half of the time of movement at a speed of 70 km / h?
Since the specified car was moving at different speeds for equal periods of time, the formula for calculating its average speed will take the form: Vav = (Sn + Sk) / t = (Vn * 0.5t + Vk * 0.5t) / t = (Vn + Vk) / 2.
Variables: Vн – initial speed of the specified vehicle (Vн = 50 km / h); Vк – final speed (Vк = 70 km / h).
Calculation: Vav = (Vn + Vk) / 2 = (50 + 70) / 2 = 60 km / h.
Answer: The average speed of the indicated vehicle was 60 km / h.
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