Question

Из одного города в другой со скоростью 60 км/ч выехал автомобиль. Через 3 ч из второго города навстречу ему выехал второй автомобиль. Они встретилисьчерез 7 ч после начала движения первого автомобиля. Найдите скорость второго автомобиля, если расстояние между городами ровно 700 км.

Answer 1

7-3=4 часа они ехали
700:4=175
175-60=115(км\ч) скорость второго автомобиля

Answer 2

Problem Analysis

We are given that a car travels from one city to another at a speed of 60 km/h. After 3 hours, another car starts from the second city and travels towards the first car. The two cars meet after 7 hours from the start of the first car's journey. We need to find the speed of the second car.

Solution

Let's assume the speed of the second car is x km/h. We can use the formula `distance = speed * time` to solve this problem.

The distance traveled by the first car after 3 hours is `60 km/h * 3 h = 180 km`.

The distance traveled by the second car after 7 hours is `x km/h * 7 h = 7x km`.

Since the two cars meet, the sum of their distances should be equal to the total distance between the cities, which is 700 km.

Therefore, we can write the equation: `180 km + 7x km = 700 km`.

Simplifying the equation, we get: `7x km = 520 km`.

To find the value of x, we divide both sides of the equation by 7: `x km = 520 km / 7`.

Calculating the value of x, we find that the speed of the second car is approximately 74.29 km/h.

Answer

The speed of the second car is approximately 74.29 km/h.