Question

Два автомобиля выехали одновремено навстречу друг другу из двух городов растояние между которыми 450 км . скорость 1 автомобиля 70 кмв час какова скорость 2 автомобиля если они встретились через 3 часа?

Answer 1

Через 3 часа 1 авто проедет 70*3=210 км
2 авто за это время проедет 450-210=240 км
скорость 2 авто 240/3=80 км/час

Answer 2

1) 70км/ч*3ч=210 км - проехал первый автомобиль
2) 450-210=240 км - проехал второй автомобиль
3) 240/3=80 км/ч - скорость второго автомобиля

Answer 3

Problem Analysis

We have two cars traveling towards each other from two different cities, and we need to find the speed of the second car given the distance between the cities, the speed of the first car, and the time it takes for them to meet.

Solution

To solve this problem, we can use the formula: distance = speed × time.

Let's denote the speed of the second car as v2 and the time it takes for them to meet as t. We know the following information: - Distance between the cities = 450 km - Speed of the first car = 70 km/h - Time taken to meet = 3 hours

Using the formula, we can set up the following equation: 70 km/h × 3 hours + v2 × 3 hours = 450 km

Simplifying the equation, we get: 210 km + 3v2 = 450 km

Now, let's solve for v2.

Calculation

To find the speed of the second car, we need to solve the equation 210 km + 3v2 = 450 km for v2.

Subtracting 210 km from both sides of the equation, we get: 3v2 = 240 km

Dividing both sides of the equation by 3, we get: v2 = 80 km/h

Answer

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

Conclusion

In this problem, we found that the speed of the second car is 80 km/h when two cars travel towards each other from two different cities, covering a distance of 450 km, and meet after 3 hours.