Предмет: Математика, автор: MrSeReGa

Один экскаватор может вырыть котлован за 5ч, второй за 8ч. Какую часть работы они выполнят за 2ч работая вместе?Очень срочно :C.

Ответы

Автор ответа: 555888999

9

Один экскаватор за 1 час выроет 1/5 а второй 1/8.

Вместе 1/5+1/8=13/40 за час

13/40*2=26/40=13/20 за - часа

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