Question

Два автомобиля выехали одновременно навстречу друг другу из 2-х городов, расстояние между которыми 450 км. Скорость первого автомобиля 70 км\ч. Какова скорость второго автомобиля, если они встретились через 3 часа?

Answer 1

70*3=210 (км) - путь первого автомобиля.
450-210=240 (км) - в пути был второй автомобиль

240: 3=80 (км ч) - скорость первого автомобиля

Answer 2

Problem Analysis

Two cars are traveling towards each other from two different cities, and the distance between the cities is 450 km. The speed of the first car is given as 70 km/h. We need to find the speed of the second car if they meet after 3 hours.

Solution

To find the speed of the second car, we can use the formula:

Distance = Speed × Time

Let's denote the speed of the second car as x km/h. The distance traveled by the first car in 3 hours is 70 × 3 = 210 km. The distance traveled by the second car in 3 hours is also 210 km. Since the total distance between the cities is 450 km, the remaining distance for the second car is 450 - 210 = 240 km.

Now we can set up the equation:

240 = x × 3

Simplifying the equation, we get:

x = 240 / 3 = 80 km/h

Therefore, the speed of the second car is 80 km/h.

Answer

The speed of the second car is 80 km/h.