Question

Саша первые 4 км прошел за 60 минут, а следующие 12 км - за 4 часа. Определить среднюю скорость Саши (км/ч) на всём пути.

Answer 1

Средняя скорость - это отношение всего пути ко времени, за которое этот путь был пройден
V ср. = $\frac{S}{t}$
S =  4 км + 12 км = 16 км
t  = 1 ч + 4 ч = 5 ч
V ср. =  $\frac{16}{5}$ =  3,2 км/ч

Answer 2

Calculation of Sasha's Average Speed

To determine Sasha's average speed on the entire journey, we need to calculate the total distance traveled and the total time taken.

Sasha first traveled 4 km in 60 minutes, which is 1 hour. Then, he traveled the next 12 km in 4 hours. Therefore, the total distance traveled is 4 km + 12 km = 16 km, and the total time taken is 1 hour + 4 hours = 5 hours.

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

Average Speed = Total Distance / Total Time

Substituting the values, we get:

Average Speed = 16 km / 5 hours

Now, let's calculate the average speed:

Average Speed = 3.2 km/h

Therefore, Sasha's average speed on the entire journey is 3.2 km/h.