Question

Автомобиль 3 часа двигался со скоростью 25 м/с, а затем проехал ещё 18 км со скоростью 54км/ч Какова его средняя скорость на всем пути?

Answer 1

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Answer 2

Calculation of Average Speed

To calculate the average speed of the car over the entire journey, we need to find the total distance traveled and the total time taken.

The car traveled for 3 hours at a speed of 25 m/s and then traveled an additional 18 km at a speed of 54 km/h.

Let's calculate the average speed step by step:

1. Convert the speed of 25 m/s to km/h: - 25 m/s = 25 * 3.6 km/h = 90 km/h.

2. Calculate the distance traveled in the first part of the journey: - Time = 3 hours - Speed = 90 km/h - Distance = Speed * Time = 90 km/h * 3 hours = 270 km.

3. Calculate the distance traveled in the second part of the journey: - Distance = 18 km.

4. Calculate the total distance traveled: - Total Distance = Distance of the first part + Distance of the second part = 270 km + 18 km = 288 km.

5. Calculate the total time taken: - Time = Time of the first part + Time of the second part = 3 hours + (18 km / 54 km/h) = 3 hours + 0.333 hours = 3.333 hours.

6. Calculate the average speed: - Average Speed = Total Distance / Total Time = 288 km / 3.333 hours ≈ 86.43 km/h.

Therefore, the average speed of the car over the entire journey is approximately 86.43 km/h.

Please note that the calculations are approximate due to rounding.

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