Question

Два автомобиля,расстояние между которыми было 50 км,одновременно начали движение в одном направлени.Скорость автомобиля,движущегося в переди,80 км/час.Через какое время второй автомобиль догонит первый,если скорость его будет 90 км/час? Решите задачу пожалуйста!!!

Answer 1

90-80=10 км/ч разница скоростей
50/10=5 часов

Answer 2

90км/ч - 80км/ч = 10км/ч  - c такой скоростью будет преодолевать начальное растояние 50км
50км : 10км/ч = 5ч - за 5 часов

Answer 3

Problem Analysis

We have two cars moving in the same direction, with a distance of 50 km between them. The first car is moving at a speed of 80 km/h, and we need to find out how long it will take for the second car, moving at a speed of 90 km/h, to catch up to the first car.

Solution

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

Let's denote the time it takes for the second car to catch up to the first car as t.

The distance covered by the first car in time t is given by: distance = speed * time.

The distance covered by the second car in time t is given by: distance = (speed + 50) * time.

Since both distances are equal, we can set up the equation:

(speed + 50) * t = speed * t

Simplifying the equation, we get:

50t = speed * t

Dividing both sides of the equation by t, we get:

50 = speed

Substituting the given values, we find that the speed of the first car is 80 km/h.

Therefore, the second car will never catch up to the first car, as their speeds are equal.

Answer

The second car will never catch up to the first car, as their speeds are equal.