Предмет: Математика, автор: Алиша2904

СО СХЕМОЙ. Мальчики прошли от станции до деревни 20 км, двигаясь со скоростью 5 км/ ч, а обратно они ехали на велосипеде в два раза быстрее. За сколько часов они проедут это расстояние ?

Ответы

Автор ответа: horkovva

20÷5=4 часа мальчики затратили на дорогу до станции
5×2=10 км/ч скорости на велосипеде
20÷10=2 часа на дорогу обратно до дома.
4+2=6 часов они потратят на всю дорогу, туда и обратно. V5 км/ч --> t--> <-- ? <--V10км/ч ----------------------------------------------------------- S=20км

Алиша2904: Я где схема ?

horkovva: Прости с телефона пишу((( не могу нарисовать

horkovva: V5 км/ч --> S=20км <--V10км/ч t--> <-- ? МОЖЕТ ТАК?

horkovva: Схему выше срисуй)

horkovva: Сфигали нарушение то?

Автор ответа: MrSolution

Схема:

|-5км/ч-> t - ? <-10км/ч-|
|------------20км-------------|

Решение:

S = 20км
V1 = 5км/ч
V2 = 10км/ч (следует из условия)

t = S/V2 = 20/10 = 2ч.

Ответ: 2 часа.

horkovva: Не 8, а 6 часов, ошибся

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