Question

Автомашина шла 8ч со скоростью 61,2 км/ч 4 ч со скоростью 42,6 км/ч и 5ч со скоростью 46.5 км ч по быстрее Найдите среднюю скорость движения автомашины на всём пути. вот вопрос 100б даю

Answer 1

1) 61,2 * 8 = 489,6 км - прошла машина за 8 часов;
2) 42,6 * 4 = 170,4 км - прошла машина за 4 часа;
3) 46,5 * 5 = 232,5 км - прошла машина за 5 часов;
4) 489,6 + 170,4 + 232,5 = 892,5 км - всё расстояние;
5) 8 + 4 + 5 = 17 ч - время в пути;
6) 892,5 : 17 = 52,5 км/ч - средняя скорость движения автомашины на всём пути.
Выражение: (61,2 * 8 + 42,6 * 4 + 46,5 * 5) : (8 + 4 + 5) = 52,5
Ответ: 52,5 км/ч.

Answer 2

S1=8*61,2=489,6
S2=4*42,6=170,4
S3=5*46,5=232,5
T=8+4+5=17 часов
Sвсё=489,6+170,4+232,5=892,5

V=892,5:17=52,5

Answer 3

Calculation of Average Speed

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

The car traveled for 8 hours at a speed of 61.2 km/h, 4 hours at a speed of 42.6 km/h, and 5 hours at a speed of 46.5 km/h.

To calculate the total distance, we can add up the distances traveled during each time interval:

Distance traveled in the first 8 hours = 8 hours * 61.2 km/h = 489.6 km

Distance traveled in the next 4 hours = 4 hours * 42.6 km/h = 170.4 km

Distance traveled in the last 5 hours = 5 hours * 46.5 km/h = 232.5 km

Total distance traveled = 489.6 km + 170.4 km + 232.5 km = 892.5 km

To calculate the total time taken, we can add up the individual time intervals:

Total time taken = 8 hours + 4 hours + 5 hours = 17 hours

Now, we can calculate the average speed by dividing the total distance by the total time:

Average speed = Total distance / Total time = 892.5 km / 17 hours ≈ 52.5 km/h.

Therefore, the average speed of the car over the entire journey is approximately 52.5 km/h.