Question

Из одного города в другой выехал поезд первую половину расстояния он проехал за 2,4 часа со скоростью 72,75 километров в час а вторую половину за 3,6 часа Найдите среднюю скорость поезда

Answer 1

1) 72,75 * 2,4 = 174,6 км это  половина расстояния, который прошел поезд
2) 174,6 * 2 = 349,2 км это весь путь который прошел поезд 
3) 2,4+3,6 = 6 часов все время  потраченное в пути
4) 349,2 : 6 = 58,2 км/ч  это средняя скорость поезда
 Ответ 58,2 км/ч 

Answer 2

Problem Analysis

We are given that a train traveled the first half of the distance in 2.4 hours at a speed of 72.75 kilometers per hour, and the second half of the distance in 3.6 hours. We need to find the average speed of the train.

Solution

To find the average speed of the train, we can use the formula:

Average Speed = Total Distance / Total Time

Let's calculate the total distance and total time.

The time taken for the first half of the distance is 2.4 hours, and the speed is 72.75 kilometers per hour. Therefore, the distance covered in the first half is:

Distance1 = Speed1 * Time1

Substituting the given values:

Distance1 = 72.75 km/h * 2.4 h

Similarly, the time taken for the second half of the distance is 3.6 hours. Therefore, the distance covered in the second half is:

Distance2 = Speed2 * Time2

Substituting the given values:

Distance2 = Speed2 * 3.6

The total distance covered by the train is the sum of the distances covered in the first and second halves:

Total Distance = Distance1 + Distance2

The total time taken by the train is the sum of the times taken for the first and second halves:

Total Time = Time1 + Time2

Finally, we can calculate the average speed using the formula:

Average Speed = Total Distance / Total Time

Let's substitute the calculated values and find the average speed.

Calculation

Given: - Speed1 = 72.75 km/h - Time1 = 2.4 hours - Time2 = 3.6 hours

Calculations: - Distance1 = 72.75 km/h * 2.4 h = 174.6 km - Distance2 = Speed2 * 3.6

We don't have the value of Speed2, so we cannot calculate Distance2. Therefore, we cannot calculate the total distance or the average speed.

Answer

Unfortunately, we cannot calculate the average speed of the train because we don't have the value of Speed2.