Question

Помогите мне это нужно сделать сейчас !Второй велосипедист едет вслед за первым. Скорость первого 12,6 километров в час, а скорость второго 13,8 километров в час. Сейчас между ними 0,52 километров. Какое расстояние было между ними 0,4 часа назад?

Answer 1

1) 13.8 - 12.6 = 1.2 ( км/ч ) - скорость сближения
2) 1.2 * 0.4 = 0.48 ( км ) - уменьшится расстояние за 0.4 часа
3) 0.52 - 0.48 = 0.04 ( км ) - расстояние через 0.4 часа

Answer 2

Problem Analysis

We are given the speeds of two cyclists and the initial distance between them. We need to calculate the distance between them 0.4 hours ago.

Solution

To find the distance between the two cyclists 0.4 hours ago, we need to calculate the distance traveled by each cyclist in that time period and subtract it from the initial distance between them.

Let's calculate the distance traveled by each cyclist in 0.4 hours.

The distance traveled by the first cyclist is given by: distance_1 = speed_1 * time

Substituting the given values: distance_1 = 12.6 km/h * 0.4 h

The distance traveled by the second cyclist is given by: distance_2 = speed_2 * time

Substituting the given values: distance_2 = 13.8 km/h * 0.4 h

Now, we can calculate the final distance between the two cyclists 0.4 hours ago by subtracting the distance traveled by each cyclist from the initial distance between them.

final_distance = initial_distance - distance_1 - distance_2

Substituting the given values: final_distance = 0.52 km - (12.6 km/h * 0.4 h) - (13.8 km/h * 0.4 h)

Let's calculate the final distance.

Calculation

Using the given values: - Speed of the first cyclist: 12.6 km/h - Speed of the second cyclist: 13.8 km/h - Initial distance between them: 0.52 km - Time: 0.4 hours

We can calculate the final distance between the two cyclists 0.4 hours ago.

distance_1 = 12.6 km/h * 0.4 h = 5.04 km

distance_2 = 13.8 km/h * 0.4 h = 5.52 km

final_distance = 0.52 km - 5.04 km - 5.52 km = -10.04 km

Answer

The distance between the two cyclists 0.4 hours ago was approximately -10.04 kilometers.

Please note that the negative sign indicates that the second cyclist was ahead of the first cyclist at that time.

Let me know if there's anything else I can help you with!