# The car (30 km) covered the first part of the journey at an average speed of 15 m / s.

The car (30 km) covered the first part of the journey at an average speed of 15 m / s. The rest of the distance (40 km) he covered in 1 hour. What is the average speed of the car on all the way

Average vehicle speed:

Vav. = S / t, where S is the total distance traveled by the car (S = S1 + S2, where S1 = 30 km, S2 = 40 km), t is the total time of movement of the car (t = t1 + t2, where t2 = 1 h) …

Track section S1:

t1 = S1 / V1, where V1 = 15 m / s (54 km / h).

Let’s calculate the average speed of the vehicle:

Vav. = (S1 + S2) / (t1 + t2) = (S1 + S2) / (S1 / V1 + t2) = (30 + 40) / (30/54 + 1) = 70 / 1.56 ≈ 45 km / h

Answer: The average vehicle speed is 45 km / h.

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