Question

Задача из двух городов навстречу друг другу одновремено выышли два поезда скорость первого 85 км:ч второго 70 км:ч поезда встретились через 5ч найди расстояние между городами какое растояние было между поездами за 2ч до встречи

Answer 1

1) 85+70=155 км/ч скорость сближения
2) 155*5=775 км расстояние между городами
3) 155*2=310 км будет за 2 часа до встречи

Answer 2

1) 85 + 70 = 155(км/ч) - скорость сближения
2) 155 * 5 = 775(км) расстояние между городами
3) 5 - 2 = 3(часа) ехали поезда
4) 155 * 3 = 465(км) поезда прошли до встречи
5) 775 - 465 = 310(км)
Ответ: 310км - расстояние между поездами за 2 часа до встречи.

Answer 3

Task Analysis

The task involves finding the distance between two cities and the initial distance between two trains before they meet.

Given Information

- Speed of the first train: 85 km/h - Speed of the second train: 70 km/h - Trains meet after 5 hours

Calculating the Distance Between the Cities

To find the distance between the cities, we can use the formula: Distance = Speed × Time

For the first train: Distance = 85 km/h × 5 h = 425 km

For the second train: Distance = 70 km/h × 5 h = 350 km

The total distance between the cities is the sum of the distances covered by both trains: Total distance = 425 km + 350 km = 775 km

Calculating the Initial Distance Between the Trains

To find the initial distance between the trains 2 hours before they meet, we can use the relative speed of the trains.

The relative speed of the trains is the sum of their speeds: Relative speed = 85 km/h + 70 km/h = 155 km/h

Using the formula: Distance = Speed × Time Distance = 155 km/h × 2 h = 310 km

Conclusion

- The distance between the cities is 775 km. - The initial distance between the trains 2 hours before they meet is 310 km.