Question

Из двух городов ,расстояние между которыми 260 км.выехали одновременно навстречу друг другу два автомобиля и встретились через 2 часа.Другой автомобиль ехал со скоростью 70 км./час.С какой скоростью ехал первый автомобиль?

Answer 1

1) 260 : 2 = 130 ( км/час ) скорость сближения
2) 130 - 70 = 60 ( км/час ) Ответ

Answer 2

Problem Analysis

We have two cars traveling towards each other from two different cities. The distance between the cities is 260 km. The second car is traveling at a speed of 70 km/h. We need to find the speed of the first car.

Solution

Let's assume the speed of the first car is x km/h.

We know that the time taken by both cars to meet is 2 hours.

Using the formula time = distance / speed, we can calculate the distance traveled by each car.

The distance traveled by the first car is x * 2 km.

The distance traveled by the second car is 70 * 2 km.

Since the total distance traveled by both cars is equal to the distance between the cities (260 km), we can set up the following equation:

x * 2 + 70 * 2 = 260

Simplifying the equation, we get:

2x + 140 = 260

Subtracting 140 from both sides, we get:

2x = 120

Dividing both sides by 2, we get:

x = 60

Therefore, the speed of the first car is 60 km/h.

Answer

The first car was traveling at a speed of 60 km/h.