# The car drove 36 km in the first 0.5 h, and for the next 0.5 h it moved at a speed of 25 m / s.

The car drove 36 km in the first 0.5 h, and for the next 0.5 h it moved at a speed of 25 m / s. What is the average ground speed of the vehicle along the way?

These tasks: t1 (the first time of the car on the way) = t2 (the second time on the way) = 0.5 h (1800 s); S1 (first covered path) = 36 km (36 * 10 ^ 3 m); V2 (ground speed on the second section of the track) = 25 m / s.

Let’s define the formula for calculating the average ground speed of the vehicle: V = S / t = (S1 + S2) / 2t1 = (S1 + V2 * t2) / 2t1.

Calculation: V = (36 * 10 ^ 3 + 25 * 1800) / (2 * 1800) = 22.5 m / s (81 km / h).

Answer: The average ground speed is 81 km / h or 22.5 m / s.

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