Question

Из пункта А и Б навстречу друг другу вышли два пешехода. скорость первого 4км/ч, а скорость второго 5км/ч. определите через какое время расстояние между пешеходами составит 19км,если расстояние между пунктами А и Б -41,5км

Answer 1

Скорость сближения - 4+5=9км/ч.
между ними должно остаться 19 км, т.е. вместе они должны пройти 41.5-19=22.5 км.
пройдут они это расстояние за 22.5/9=2.5 часа

Answer 2

Problem Analysis

We are given that two pedestrians start walking towards each other from points A and B. The speed of the first pedestrian is 4 km/h, and the speed of the second pedestrian is 5 km/h. We need to determine how long it will take for the distance between the pedestrians to be 19 km, given that the distance between points A and B is 41.5 km.

Solution

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

Let's denote the time it takes for the pedestrians to meet as t. The distance traveled by the first pedestrian in time t is 4t, and the distance traveled by the second pedestrian in time t is 5t.

Since the pedestrians are walking towards each other, the sum of the distances traveled by both pedestrians should be equal to the distance between points A and B, which is 41.5 km.

Therefore, we can write the equation: 4t + 5t = 41.5.

Simplifying the equation, we get: 9t = 41.5.

To find the value of t, we divide both sides of the equation by 9: t = 41.5 / 9.

Now, we can calculate the value of t to determine how long it will take for the distance between the pedestrians to be 19 km.

Calculation

Let's calculate the value of t:

t = 41.5 / 9

Using a calculator, we find that t ≈ 4.6111.

Therefore, it will take approximately 4.6111 hours for the distance between the pedestrians to be 19 km.

Answer

The time it will take for the distance between the pedestrians to be 19 km is approximately 4.6111 hours.