Question

Автобус и автомобиль вышли одновременно навстречу друг другу из городов ,расстояние между которыми 480 км .Через сколько часов автобус и автомобиль встретятся ,если скорость автобуса 50 км ч ,а скорость автомобиля 70ки ч ?

Answer 1

Пусть они встретятся через х часов.
50х+70х=480
120х=480
х=480/120
х=4 часа
Ответ: через 4 часа

Answer 2

Problem Analysis

We are given that a bus and a car start from two different cities and travel towards each other. The distance between the cities is 480 km. The speed of the bus is 50 km/h, and the speed of the car is 70 km/h. We need to determine how many hours it will take for the bus and the car to meet.

Solution

To solve this problem, we can use the formula: time = distance / speed. We can calculate the time it takes for the bus and the car to meet by dividing the distance between the cities by the sum of their speeds.

Let's calculate the time it takes for the bus and the car to meet.

Calculation

The distance between the cities is 480 km. The speed of the bus is 50 km/h. The speed of the car is 70 km/h.

The time it takes for the bus and the car to meet is given by the formula: time = distance / (speed of bus + speed of car).

Substituting the given values: time = 480 km / (50 km/h + 70 km/h).

Calculating the sum of the speeds: 50 km/h + 70 km/h = 120 km/h.

Substituting the sum of the speeds into the formula: time = 480 km / 120 km/h.

Simplifying the expression: time = 4 hours.

Therefore, the bus and the car will meet after 4 hours.

Answer

The bus and the car will meet after 4 hours.

Explanation

When the bus and the car start from two different cities and travel towards each other, they will meet when the sum of the distances covered by both vehicles is equal to the distance between the cities. In this case, the distance between the cities is 480 km. The bus is traveling at a speed of 50 km/h, and the car is traveling at a speed of 70 km/h. By dividing the distance between the cities by the sum of their speeds, we can calculate the time it takes for them to meet. In this case, it will take 4 hours for the bus and the car to meet.