Question

Из двух городов, расстояние между которыми 820 км, одновременно вышли на встречу друг другу два поезда и встретились через 5 часов. Первый поезд шёл со скоростью 76 км/час. С какой скоростью шёл второй поезд?​

Answer 1

Ответ:

Пошаговое объяснение:

76 * 5= 380 км прошел первый поезд

820 - 380 = 440 км прошел второй поезд

440 : 5 = 88 км/ч скорость второго поезда

Answer 2

Можно решить через скорость сближения.

1) 820 : 5=164 км/ч  -  суммарная скорость

2) 164 - 76=88 км/ч

Ответ: 88 км/ч.

Answer 3

Problem Analysis

We are given that two trains start simultaneously from two cities that are 820 km apart and meet each other after 5 hours. The speed of the first train is given as 76 km/h. We need to find the speed of the second train.

Solution

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

Speed = Distance / Time

Let's calculate the speed of the second train using this formula.

Calculation

The distance between the two cities is 820 km, and the time taken to meet is 5 hours.

For the first train: - Distance = 820 km - Time = 5 hours - Speed = Distance / Time = 820 km / 5 hours = 164 km/h

Therefore, the speed of the first train is 164 km/h.

To find the speed of the second train, we can subtract the speed of the first train from the relative speed of the two trains.

The relative speed of the two trains is the sum of their speeds when they are moving towards each other.

Relative speed = Speed of first train + Speed of second train

Let's substitute the values and calculate the speed of the second train.

Relative speed = 164 km/h + Speed of second train

Since the two trains meet each other, the total distance covered by both trains is equal to the distance between the two cities, which is 820 km.

Total distance = Distance covered by first train + Distance covered by second train

Total distance = Speed of first train * Time + Speed of second train * Time

Substituting the values:

820 km = 164 km/h * 5 hours + Speed of second train * 5 hours

Rearranging the equation to solve for the speed of the second train:

Speed of second train = (820 km - 164 km/h * 5 hours) / 5 hours

Calculating the speed of the second train:

Speed of second train = (820 km - 820 km) / 5 hours = 0 km/h

Therefore, the speed of the second train is 0 km/h.

Answer

The second train was traveling at a speed of 0 km/h.