Предмет: Математика, автор: elvinafrolova

2 ч 47 мин + 5 ч 40 мин=
28 ч 10 мин - 4 ч 10 мин=
2 ч 49 мин*10=
8 ч 27 мин :3=

Ответы

Автор ответа: Alinka090708

0

Все данные переводим в минуты(так легче):
1.2ч 47мин=120мин+47мин=167мин
   5ч 40мин=300мин(5*60)+40=340мин
     167мин+340мин=507мин
       507мин(507:60)=8ч 27мин
Ответ: 8ч 27 мин

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