Предмет: Математика, автор: pokruv75

Пожалуйста помогите решить задачу, и не как у других, а нормально, не там где 2x 4x, просто не понимаю, а у меня 15 минут!!!! дам 30 баллов

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Ответы

Автор ответа: onetfriend

0

Ответ:

40 секунд

Пошаговое объяснение:

скорость первого бегуна 4 м/с а второго 2 м/с. Скорость первого бегуна относительно скорости второго 4-2 = 2 м/с. Тогда первый бегун удалится от второго на 80 метров за 80 /2 = 40 секунд.

Или уравнением:

v1 = 4 м/с скорость первого бегуна

v2 = 2 м/с скорость второго бегуна

t - время котрое нужно найти

S1= v1 * t - путь первого бегуна

S2 = v2 * t - путь второго бегуна

S1-S2=80

(v1*t) - (v2*t) = 80

4t - 2t = 80

2t = 80

t = 80 : 2

t = 40 с (время через которое расстояние между бегунами станет 80 метров)

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