On the first section of the route, the car moved at a speed of 54 km / h for 20 minutes

On the first section of the route, the car moved at a speed of 54 km / h for 20 minutes, and drove the next 5 km in 5 minutes. What was the average speed of the car?

V1 = 54 km / h = 15 m / s.

t1 = 20 min = 1200 s.

S2 = 5 km = 5000 m.

t2 = 5 min = 300 s.

Vav -?

To find the average speed Vav of the vehicle, it is necessary to divide the entire path S traveled by the time of movement t along the entire path: Vav = S / t.

We express the entire path of the car S and the time of movement t by the formulas: S = S1 + S2, t = t1 + t2.

S1 = V1 * t1.

S1 = 15 m / s * 1200 s = 18000 m.

S = 18000 m + 5000 m = 23000 m.

t = 1200 s + 300 s = 1500 s.

Vav = 23000 m / 1500 s = 15.3 m / s.

Answer: the average vehicle speed is Vav = 15.3 m / s.

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