Question

Два туриста вышли одновременно навстречу друг другу из пунктов , расстояние между которыми 18 км . скорость одного 4км/ч , а второго 5 км/ч. Через сколько часовтони встретятся

Answer 1

Скорость сближения:
4+5 = 9 км/ч
Время до встречи:
18:9=2 часа

Ответ: через 2 часа.

Answer 2

Problem Analysis

We have two tourists who start walking towards each other from two different points. The distance between the points is 18 km. The first tourist has a speed of 4 km/h, and the second tourist has a speed of 5 km/h. We need to determine how many hours it will take for them 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 first tourist to meet the second tourist.

The distance between the two points is 18 km. The first tourist has a speed of 4 km/h, so the time it will take for the first tourist to cover the distance is:

time1 = distance / speed1 = 18 km / 4 km/h = 4.5 hours.

Similarly, the time it will take for the second tourist to cover the distance is:

time2 = distance / speed2 = 18 km / 5 km/h = 3.6 hours.

Since they both started at the same time, the total time it will take for them to meet is the maximum of the two times:

total time = max(time1, time2) = max(4.5 hours, 3.6 hours) = 4.5 hours.

Therefore, the two tourists will meet after 4.5 hours.

Answer

The two tourists will meet after 4.5 hours.

Note: The above solution assumes that the two tourists are walking towards each other in a straight line without any obstacles or changes in speed.