Question

Два велосипедиста выехали одновременно навстречутдруг другу из двух сёл ,расстояние между ними 54км. скорость первого 12км в час, второго 15 км в час. через сколько часов они будут находиться друг от друга на расстоянии 27км.

Answer 1

(54-(12+15)):(12+15)=1(ч)
Ответ: через 1 час расстояние между ними будет 27 км.

Answer 2

12+15=27(км/ч) - скорость сближения велосипедистов
54-27=27(км) - расстояние между ними через 1 час
Ответ: через 1 час

Answer 3

Problem Analysis

Two cyclists start simultaneously from two different villages and are moving towards each other. The distance between the villages is 54 km. The first cyclist has a speed of 12 km/h, while the second cyclist has a speed of 15 km/h. We need to determine how many hours it will take for them to be 27 km apart.

Solution

To solve this problem, we can use the formula: time = distance / speed. We will calculate the time it takes for each cyclist to cover the given distances and then find the time at which they are 27 km apart.

Let's calculate the time it takes for the first cyclist to cover a distance of 27 km: - Distance = 27 km - Speed = 12 km/h - Time = Distance / Speed = 27 km / 12 km/h = 2.25 hours

Now, let's calculate the time it takes for the second cyclist to cover a distance of 27 km: - Distance = 27 km - Speed = 15 km/h - Time = Distance / Speed = 27 km / 15 km/h = 1.8 hours

Since the two cyclists started simultaneously, we need to find the time at which they are 27 km apart. We can do this by finding the average of the two times calculated above: - Average time = (2.25 hours + 1.8 hours) / 2 = 2.025 hours

Therefore, the two cyclists will be 27 km apart after approximately 2.025 hours.

Answer

The two cyclists will be approximately 27 km apart after 2.025 hours.