Question

Первые 2 часа автомобиль ехал со скоростью 66 км/ч следующие 3 часа со скоростью 88 км/ч а последний час со скоростью 72 км/ч найдите среднюю скорость на протяжении всего пути.

Answer 1

2*66=132
3*88=264
72
132+264+72=468
468:6=78

Answer 2

Calculating Average Speed

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

Average Speed = Total Distance / Total Time

The total distance traveled can be calculated by adding the distances traveled at each speed, and the total time is the sum of the individual times.

Calculating Total Distance

The total distance can be calculated by adding the distances traveled at each speed. To find the distances, we can use the formula:

Distance = Speed × Time

Using the given speeds and times: - Distance traveled at 66 km/h for 2 hours = 66 km/h × 2 h = 132 km - Distance traveled at 88 km/h for 3 hours = 88 km/h × 3 h = 264 km - Distance traveled at 72 km/h for 1 hour = 72 km/h × 1 h = 72 km

Adding these distances together: Total Distance = 132 km + 264 km + 72 km = 468 km

Calculating Total Time

The total time is the sum of the individual times: Total Time = 2 hours + 3 hours + 1 hour = 6 hours

Calculating Average Speed

Now, we can calculate the average speed using the formula: Average Speed = Total Distance / Total Time Average Speed = 468 km / 6 hours = 78 km/h

So, the average speed over the entire journey is 78 km/h.