Предмет: Математика, автор: m1r2K

помогите
из 2 городов расстояние между которыми 420 км одновременно на встречу друг другу выехали грузовые машины
а) U= 60 км/ч, 80км/ч
через t=? ч. после их встречи грузовая машина доедет до пункта

б) через 3 с половиной
U груз в 3 р< u легковой

m1r2K: помогите

m1r2K: ПОМОГИТЕ

kamardasyarik990: я не пойму что написано в б но задачу решу

m1r2K: реши так просто как-то м0тематичка написала так

Ответы

Автор ответа: kamardasyarik990

Ответ:3часа

Пошаговое объяснение:

1) 60+80=140(км/ч)- V совместноя

2) 420:140=3(ч)- t за сколько они встретятса

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