Question

Из одного пункта одновременно вышли два лыжники отправились впротивоположных направлениях. скорость первого лыжники равна 12км/ч.а второго 15км/ччерез некоторое время они остановились. в тот моментрасстояние между ними было 81км.сколько времени они были пути до остановки?

Answer 1

81:(15+12)=81:17=3(ч) были в пути лыжники

Answer 2

Problem Analysis

We have two skiers who start from the same point and travel in opposite directions. The first skier has a speed of 12 km/h, and the second skier has a speed of 15 km/h. After some time, they both stop, and at that moment, the distance between them is 81 km. We need to find out how much time they were traveling before they stopped.

Solution

Let's assume that the time they were traveling before they stopped is 't' hours.

The distance traveled by the first skier can be calculated using the formula: distance = speed * time. Therefore, the distance traveled by the first skier is 12t km.

Similarly, the distance traveled by the second skier is 15t km.

Since they are traveling in opposite directions, the total distance between them is the sum of the distances traveled by each skier. Therefore, we have the equation:

12t + 15t = 81

Simplifying the equation:

27t = 81

Dividing both sides of the equation by 27:

t = 3

Therefore, they were traveling for 3 hours before they stopped.

Answer

They were traveling for 3 hours before they stopped.

Source:

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