Question

Задача пешеход в течение 4 ч двигался со скоростью 4,5 км/ч, а затем в течение 2 ч со скоростью 4,8 км/ч какова средняя скорость пешехода

Answer 1

1)4,5×4=18(км)-S1.
2)4,8×2=9,6(км)-S2.
3)18+9,6=27,6(км)- общее S.
4)4+2=6(ч)- общее t.
5)27,6÷6=4,6(км/ч)-общее V.
Ответ:4,6 км/ч.

Answer 2

Calculation of Average Speed

To calculate the average speed of a pedestrian, we need to find the total distance traveled and the total time taken. In this case, the pedestrian traveled at a speed of 4.5 km/h for 4 hours and then at a speed of 4.8 km/h for 2 hours.

To find the total distance traveled, we can add the distances covered during each period of time: - Distance covered in the first 4 hours: 4.5 km/h * 4 h = 18 km - Distance covered in the next 2 hours: 4.8 km/h * 2 h = 9.6 km

The total distance traveled is the sum of these two distances: 18 km + 9.6 km = 27.6 km.

To find the total time taken, we can simply add the two periods of time: 4 hours + 2 hours = 6 hours.

Now, we can calculate the average speed by dividing the total distance traveled by the total time taken: Average speed = Total distance / Total time = 27.6 km / 6 h ≈ 4.6 km/h.

Therefore, the average speed of the pedestrian is approximately 4.6 km/h.