Question

В 17 часов 45 минут из дома одновременно вышли Коля и Серёжа и пошли в одном направлении.В какое время расстояние между ними стало равным 300 метров,если Коля двигался со скоростью 80 м/мин,а Серёжа 100 м/мин?

Answer 1

100-80=20(м/мин) скорость удаления
300:20=15(мин) шли
17ч 45мин+15 мин=18ч 00 мин

Answer 2

Problem Analysis

We are given that Kolya and Sergey left their house at 17:45 and started walking in the same direction. We need to determine the time at which the distance between them becomes 300 meters. Kolya is walking at a speed of 80 m/min, while Sergey is walking at a speed of 100 m/min.

Solution

Let's assume that it takes t minutes for the distance between Kolya and Sergey to become 300 meters. During this time, Kolya would have covered a distance of 80t meters, and Sergey would have covered a distance of 100t meters.

Since they started at the same time and walked in the same direction, the distance between them can be calculated as the difference between the distances they covered:

Distance between Kolya and Sergey = Distance covered by Sergey - Distance covered by Kolya

300 meters = 100t - 80t

Simplifying the equation:

300 meters = 20t

To find the value of t, we can divide both sides of the equation by 20:

t = 300 meters / 20

t = 15 minutes

Therefore, the distance between Kolya and Sergey becomes 300 meters after 15 minutes.

Answer

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