Предмет: Алгебра, автор: kuzyaev01

Два маляра, работая вместе , могут покрасить забор за три часа. Производительности труда первого и второго маляров относятся как 3:5.
Маляры договорились работать поочерёдно. За сколько часов они покрасят забор, если второй маляр сменит первого после того, как тот покрасит половину всего забора?

Ответы

Автор ответа: OtecFizMatii
15
Производительность первого - V1, второго - V2. Я составил систему. Формула определения производительности t*V=1 . Два маляра работали вместе, поэтому их производительности складываются. Если весь забор я принял за еденицу, то 0,5 это половина
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