Question

Поезд шел 3 часа со скоростью 65,2 км/ч и 2 ч со скоростью 83,3 км/ч . Найдите среднюю скорость поезда за эти 5 часов. ПОМОГИТЕ ПОЖАЛУЙСТА БУДУ ОЧЕНЬ ВАМ БЛАГОДАРНА!!!!!

Answer 1

Находишь среднее арифметическое: 65, 2+ 83, 3=148, 5 148, 5 ÷ 2= 742, 25 (средняя скорость)

Answer 2

(65,2*3+83,3*2)/5=72,44 - {средняя скорость}

Answer 3

Calculation of Average Speed

To find the average speed of the train over a period of 5 hours, we can use the formula:

Average Speed = Total Distance / Total Time

Let's calculate the total distance traveled by the train during the given time period.

The train traveled at a speed of 65.2 km/h for 3 hours, and at a speed of 83.3 km/h for 2 hours.

To calculate the total distance, we can add the distances traveled at each speed:

Distance at 65.2 km/h = 65.2 km/h * 3 hours

Distance at 83.3 km/h = 83.3 km/h * 2 hours

Total Distance = Distance at 65.2 km/h + Distance at 83.3 km/h

Now, let's calculate the average speed using the formula mentioned above.

Calculation Steps:

1. Calculate the distance traveled at 65.2 km/h: - Distance at 65.2 km/h = 65.2 km/h * 3 hours

2. Calculate the distance traveled at 83.3 km/h: - Distance at 83.3 km/h = 83.3 km/h * 2 hours

3. Calculate the total distance: - Total Distance = Distance at 65.2 km/h + Distance at 83.3 km/h

4. Calculate the average speed: - Average Speed = Total Distance / Total Time

Let's perform the calculations:

1. Calculate the distance traveled at 65.2 km/h: - Distance at 65.2 km/h = 65.2 km/h * 3 hours = 195.6 km

2. Calculate the distance traveled at 83.3 km/h: - Distance at 83.3 km/h = 83.3 km/h * 2 hours = 166.6 km

3. Calculate the total distance: - Total Distance = Distance at 65.2 km/h + Distance at 83.3 km/h = 195.6 km + 166.6 km = 362.2 km

4. Calculate the average speed: - Average Speed = Total Distance / Total Time = 362.2 km / 5 hours = 72.44 km/h

Therefore, the average speed of the train over the 5-hour period is 72.44 km/h.