Question

Помогите решить Из точки А в точку B выехали два автомобиля.Первый ехал со скоростью 50км/ч, а второй выехал через 30 минут и поехал со скоростью 90 км/ч. Через какое время второй автомобиль догонит первый?

Answer 1

60×2=120 км прошел автомобиль за 2 часа
90-60=30 км/ч скорость сближения
120÷30=4 ч
Ответ 2 автомобиль догонит 1 за 4 часа 

Answer 2

Problem Analysis

We are given two cars that start from point A and need to determine when the second car will catch up to the first car. The first car is traveling at a speed of 50 km/h, while the second car starts 30 minutes later and travels at a speed of 90 km/h.

Solution

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

Let's assume that the time it takes for the second car to catch up to the first car is t hours.

The distance traveled by the first car in t hours is 50t km.

The distance traveled by the second car in t - 0.5 hours (30 minutes) is 90(t - 0.5) km.

Since both cars will be at the same point when the second car catches up to the first car, we can set up the equation: 50t = 90(t - 0.5).

Now, let's solve this equation to find the value of t.

Calculation

50t = 90(t - 0.5)

50t = 90t - 45

90t - 50t = 45

40t = 45

t = 45 / 40

t = 1.125 hours

Answer

The second car will catch up to the first car after approximately 1.125 hours.

Please note that the calculations are based on the given information and assumptions made.