Question

Школьники отправились в поход в лес. До места стоянки они двигались по грунтовой дороге 2 часа со скоростью 4 км/ч. Далее сделали остановку на отдых, который занял у путешественников 1 час и продолжили путь по лесу в течении 2 часов со скоростью 3 км/ч. Найдите среднюю скорость движения школьников. Ответ привести в км/ч, с точностью до десятых.

Answer 1

Ответ:

2,8 км/ч

Объяснение:

Средняя скорость v ср это общее расстояние S общ, пройденное телом, деленное на общее затраченное время t общ

v ср = S общ / t общ

S общ = 2*4 + 2*3 = 8+6=14 км

t общ = 2 ч + 1 ч +2 ч = 5 часов

v ср = S общ / t общ = 14 км / 5 ч = 2,8 км/ч

Answer 2

Calculation of Average Speed

To find the average speed of the students during their hike, we need to calculate the total distance traveled and the total time taken.

The students traveled on a dirt road for 2 hours at a speed of 4 km/h, then took a 1-hour break, and finally continued their journey through the forest for 2 hours at a speed of 3 km/h.

Let's calculate the total distance traveled:

Distance on the dirt road = Speed * Time = 4 km/h * 2 hours = 8 km Distance in the forest = Speed * Time = 3 km/h * 2 hours = 6 km

Total distance traveled = Distance on the dirt road + Distance in the forest = 8 km + 6 km = 14 km

Now, let's calculate the total time taken:

Time on the dirt road = 2 hours Break time = 1 hour Time in the forest = 2 hours

Total time taken = Time on the dirt road + Break time + Time in the forest = 2 hours + 1 hour + 2 hours = 5 hours

Finally, we can calculate the average speed:

Average Speed = Total Distance / Total Time = 14 km / 5 hours = 2.8 km/h

Therefore, the average speed of the students during their hike was 2.8 km/h.