Question

Из двух городов одновременно вышли навстречу друг другу два поезда. Скорость одного из них равна 70 км/ч, скорость другого - 78 км/ч. Встреча произошла через 4ч. Найди расстояние между городами.

Answer 1

1) 70+78=148(км/ч)-совместная скорость
2)148•4=592 (км/ ч)

Answer 2

70+78=148(км/ч)
148×4=592(км)

Answer 3

Problem Analysis

We have two trains traveling towards each other from two different cities. The speed of one train is 70 km/h, and the speed of the other train is 78 km/h. The trains meet after 4 hours. We need to find the distance between the two cities.

Solution

To find the distance between the two cities, we can use the formula:

Distance = Speed * Time

Let's calculate the distance traveled by each train and then find the total distance between the two cities.

Train 1: - Speed: 70 km/h - Time: 4 hours - Distance = 70 km/h * 4 hours = 280 km

Train 2: - Speed: 78 km/h - Time: 4 hours - Distance = 78 km/h * 4 hours = 312 km

The total distance between the two cities is the sum of the distances traveled by each train:

Total Distance = Distance of Train 1 + Distance of Train 2 = 280 km + 312 km = 592 km

Therefore, the distance between the two cities is 592 km.

Answer

The distance between the two cities is 592 km.