Question

Велосипидист проехал 30 км со скоростью 15 км/ч и 51км со скоростью 17 км/ч.Какова средняя скорость его движения на всем пройденном пути?

Answer 1

2.5 км/ч средняя скорость

Answer 2

Ср. V = $\frac{S}{t}$
Т.е. всё расстояние делим на время.
Чтобы найти время, мы делим S на V
30км/15 км/ч = 2ч
51км/17 км/ч = 3ч
Подставляем в формулу:

Answer 3

Calculation of Average Speed

To calculate the average speed of the cyclist, we need to find the total distance traveled and the total time taken.

The cyclist traveled 30 km with a speed of 15 km/h and 51 km with a speed of 17 km/h.

To find the total distance, we add the distances traveled at each speed: 30 km + 51 km = 81 km.

To find the total time taken, we divide the distances traveled at each speed by their respective speeds and add the results:

- Time taken for the first part of the journey: 30 km / 15 km/h = 2 hours. - Time taken for the second part of the journey: 51 km / 17 km/h = 3 hours.

The total time taken is 2 hours + 3 hours = 5 hours.

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

Average speed = Total distance / Total time = 81 km / 5 hours = 16.2 km/h.

Therefore, the average speed of the cyclist over the entire distance traveled is 16.2 km/h.