Question

Пешеход две трети времени своего движения шел со скоростью 3км/час.Оставшееся время-со скоростью 6км/час.Определите среднюю скорость пешехода.

Answer 1

Скорость средняя равна (V1+V2):2
Vср=(3+6):2=9:2=4,5км\час

Answer 2

Calculation of Average Speed

To calculate the average speed of a pedestrian, we need to consider the distances traveled at different speeds and the corresponding times taken.

Let's assume that the total distance traveled by the pedestrian is D kilometers. According to the given information, the pedestrian spends two-thirds of the time at a speed of 3 km/h and the remaining time at a speed of 6 km/h.

The time spent at a speed of 3 km/h is two-thirds of the total time, and the time spent at a speed of 6 km/h is one-third of the total time.

Let's denote the time spent at a speed of 3 km/h as t1 and the time spent at a speed of 6 km/h as t2.

We can calculate t1 and t2 using the following equations:

t1 = (2/3) * total_time

t2 = (1/3) * total_time

The distance traveled at a speed of 3 km/h is given by:

distance1 = 3 * t1

The distance traveled at a speed of 6 km/h is given by:

distance2 = 6 * t2

Since the total distance traveled is D, we have:

D = distance1 + distance2

Now, we can substitute the values of t1 and t2 into the equations above and solve for D.

Let's calculate the average speed using the formula:

average_speed = total_distance / total_time

Calculation Steps:

1. Calculate t1 and t2 using the given information: - t1 = (2/3) * total_time - t2 = (1/3) * total_time

2. Calculate the distances traveled at each speed: - distance1 = 3 * t1 - distance2 = 6 * t2

3. Calculate the total distance traveled: - D = distance1 + distance2

4. Calculate the average speed: - average_speed = D / total_time

Let's perform the calculations:

Given: - Speed 1: 3 km/h - Speed 2: 6 km/h

We need the total time to calculate the average speed. Unfortunately, the total time is not provided in the question. Could you please provide the total time?