Question

Расстояние между двумя городами 450 км. из этих городов одновременно выехали навстречу одна другой 2 авто,. скорость одной из них 70 км/ч, а другой 80 км/ч. Через сколько часов они встретятся? Попробуйте решить эту задачу всего в два действия.

Answer 1

1)80+70=150 км/ч скорость сближения; 2)450:150=3 часа; Ответ: через 3 часа они встретятся

Answer 2

Problem Analysis

We are given that two cars are traveling towards each other from two cities that are 450 km apart. The first car is traveling at a speed of 70 km/h, and the second car is traveling at a speed of 80 km/h. We need to determine how many hours it will take for the two cars to meet.

Solution

To solve this problem, we can use the formula:

Time = Distance / Speed

Let's calculate the time it will take for the two cars to meet.

1. Calculate the time it will take for the first car to travel the distance: - Distance = 450 km - Speed = 70 km/h - Time = Distance / Speed = 450 km / 70 km/h = 6.43 hours

2. Calculate the time it will take for the second car to travel the distance: - Distance = 450 km - Speed = 80 km/h - Time = Distance / Speed = 450 km / 80 km/h = 5.63 hours

3. The total time it will take for the two cars to meet is the sum of the times calculated in steps 1 and 2: - Total Time = 6.43 hours + 5.63 hours = 12.06 hours

Therefore, it will take approximately 12.06 hours for the two cars to meet.