Question

Первые 140 км автомобиль ехал со скоростью 70 км/ч,следующие 195 км -со скоростью 65 км/ч , а последний 225км - со скоростью 75 км/ч. Найдите среднюю скоро сть автомобиля на протяжении всего пути.

Answer 1

Нужно найти весь путь и поделить на все время, а именно:
560/2+3+3=70(км/ч)-средняя V

Answer 2

Calculating Average Speed of the Car

To find the average speed of the car over the entire journey, we can use the formula:

Average Speed = Total Distance / Total Time

We'll calculate the total time taken for each segment of the journey and then use it to find the average speed.

1. Time taken for the first 140 km at 70 km/h: - Time = Distance / Speed - Time = 140 km / 70 km/h - Time = 2 hours 2. Time taken for the next 195 km at 65 km/h: - Time = Distance / Speed - Time = 195 km / 65 km/h - Time = 3 hours 3. Time taken for the last 225 km at 75 km/h: - Time = Distance / Speed - Time = 225 km / 75 km/h - Time = 3 hours Now, we can calculate the total distance and the total time taken for the entire journey.

- Total Distance = 140 km + 195 km + 225 km - Total Distance = 560 km

- Total Time = 2 hours + 3 hours + 3 hours - Total Time = 8 hours

Finally, we can find the average speed using the formula:

Average Speed = Total Distance / Total Time Average Speed = 560 km / 8 hours Average Speed = 70 km/h

Therefore, the average speed of the car over the entire journey is 70 km/h.