Question

Первые 110 км автомобиль ехал со скоростью 55 км/ч, следующие 120 км- со скоростью 60 км/ч, а последние 140 км-со скоростью 70 км/ч. Найдите среднюю скорость автомобиля на протяжении всего пути.

Answer 1

1) 110+120+140=370 км - весь путь
2) 110:55 + 120:60+140:70=6 ч все время
3) 370:6=   61 2/3 км/ч - средняя скорость

Answer 2

T1 = T2 = T3 = 2 часа ( 110/55=120/60=140/70)
S = S1 +S2 +S3 = 110+120+140 = 370 км
T = T1 +T2 +T3 =  2+2+2=6 часа
V cp = 370 / 6 ≈ 61,7 км/ч

Answer 3

Calculation of Average Speed

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

Let's break down the given information:

- The car traveled the first 110 km at a speed of 55 km/h. - The car then traveled the next 120 km at a speed of 60 km/h. - Finally, the car traveled the last 140 km at a speed of 70 km/h.

To calculate the total time taken, we can divide the distance traveled by the respective speeds:

- Time taken for the first 110 km: 110 km / 55 km/h = 2 hours - Time taken for the next 120 km: 120 km / 60 km/h = 2 hours - Time taken for the last 140 km: 140 km / 70 km/h = 2 hours

The total time taken for the entire journey is 2 + 2 + 2 = 6 hours.

To calculate the average speed, we divide the total distance traveled by the total time taken:

- Total distance traveled: 110 km + 120 km + 140 km = 370 km - Average speed: 370 km / 6 hours = 61.67 km/h

Therefore, the average speed of the car over the entire journey is approximately 61.67 km/h.