Question

в 17часов 45минут из дома одновременно вышли Коля и Серёжа и пошли в одном напровление .В какое время расстояние между ними стало равным 300метров , если Коля двигался со скоростью 80м/минуту , а Серёжа - со скоростью 100/метров/ минene 4 класс

Answer 1

100-80=20 м в минуту разница между ними была за минуту
300:20=15 минут через 15 минут разница у них будет 300 метров 

17:45+15 минут= 18ч во столько между ними будет расстояние 300 м

ответ:18ч00мин

Answer 2

Problem Analysis

We are given that Kolya and Sergey left their homes at the same time and walked in the same direction. We need to determine the time at which the distance between them became 300 meters. Kolya walks at a speed of 80 meters per minute, while Sergey walks at a speed of 100 meters per minute.

Solution

To solve this problem, we can set up an equation based on the given information. Let's assume that the time it takes for the distance between Kolya and Sergey to become 300 meters is t minutes.

The distance Kolya covers in t minutes is given by the formula: distance = speed * time. Therefore, the distance Kolya covers in t minutes is 80t meters.

Similarly, the distance Sergey covers in t minutes is given by the formula: distance = speed * time. Therefore, the distance Sergey covers in t minutes is 100t meters.

According to the problem, the distance between Kolya and Sergey becomes 300 meters after t minutes. Therefore, we can set up the equation:

80t + 300 = 100t

Simplifying the equation:

300 = 20t

Dividing both sides of the equation by 20:

t = 15

Therefore, the time at which the distance between Kolya and Sergey becomes 300 meters is 15 minutes.

Answer

The distance between Kolya and Sergey becomes 300 meters after 15 minutes.