The car drove the first 8 km at 40 km / h, and the next 6 km at 20 km / h.

The car drove the first 8 km at 40 km / h, and the next 6 km at 20 km / h. Determine the average speed of the vehicle over the entire section of the road.

Initial data: S1 (length of the first leg) = 8 km, V1 (speed on the first leg) = 40 km / h, S2 (length of the second leg) = 6 km, V2 (speed on the second leg) = 20 km / h

Formula for calculation:

Vav = S / t = (S1 + S2) / (t1 + t2) = (S1 + S2) / (S1 / V1 + S2 / V2).

Let’s do the calculation:

Vav = (8 + 6) / (8/40 + 6/20) = 14 / 0.5 = 28 km / h.

Answer: The average speed of the vehicle along the entire route was 28 km / h.