Предмет: Математика, автор: mashavasileva2010

б) Пешеход, скорость которого 4,5 км/ч, проходит расстоя- ние от города до деревни за 3 ч 15 мин. Сколько времени понадобится пешеходу, чтобы пройти это расстояние, если он увеличит свою скорость на 1,5 км/ч?

vitaliyfnaf: Так как известна скорость и время, узнаём длину (l)

vitaliyfnaf: Прости, не дописал, сейчас в ответе полное напишу, на энтер случайно нажал

mashavasileva2010: ну что?

Ответы

Автор ответа: vitaliyfnaf

1

Ответ:

Пошаговое объяснение:

Дано | V = t/l -> l = V * t
t1 = 3,25ч | l = 4,5км/ч * 3,25ч = 15,125 км
V1 = 4,5км/ч | t2 = l/V2 = 15,125 км/6км/ч= ~2,5 ч = 2 ч 30 минут
V2 = V1+1,5км/ч |
Найти |
------------------------|
l - ? |
t2 - ? | Ответ: примерно 2ч и 30 минут

vitaliyfnaf: Рядом с t V и т.д. есть цифры, их надо писать справа снизу от буквы, если вдруг не знаешь

vitaliyfnaf: Что не так? t - время, V - скорость, l - длина

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