Question

из двух городов навстречу друг другу одновременно вышли два поезда.Скорость первого-85км/ч, второго-70км/ч.Поезда встретились через 5ч. Найди расстояние между городами. Какое расстояние было между поездами за 2ч до встречи?

Answer 1

Given Information:

- Speed of the first train: 85 km/h - Speed of the second train: 70 km/h - Time taken for the trains to meet: 5 hours

Finding the Distance between the Cities:

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

Let's calculate the distance traveled by each train: - Distance traveled by the first train = 85 km/h × 5 hours = 425 km - Distance traveled by the second train = 70 km/h × 5 hours = 350 km

Since the trains are traveling towards each other, the total distance between the cities is the sum of the distances traveled by each train: - Total distance between the cities = 425 km + 350 km = 775 km

Therefore, the distance between the cities is 775 km.

Finding the Distance between the Trains 2 Hours before the Meeting:

To find the distance between the trains 2 hours before the meeting, we need to calculate the distance traveled by each train during that time.

Let's calculate the distance traveled by each train: - Distance traveled by the first train = 85 km/h × 2 hours = 170 km - Distance traveled by the second train = 70 km/h × 2 hours = 140 km

Since the trains are traveling towards each other, the distance between them 2 hours before the meeting is the difference between the distances traveled by each train: - Distance between the trains = 170 km - 140 km = 30 km

Therefore, the distance between the trains 2 hours before the meeting is 30 km.

Please note that the sources provided do not contain relevant information for this specific problem. The calculations are based on the given information and basic mathematical principles.