Question

7. A, B and C working together can finish a piece of
work in 8 hours. A alone can do it in 20 hours
and B alone can do it in 24 hours. In how many
hours will C alone do the same work?

Answer 1

Answer:

30 hours

Step-by-step explanation:

A work=1÷20,B work= 1÷24 Total work =1÷8

1÷20+1÷24+1÷c= 1÷8

1÷c = 4÷120= 1÷30

so, 30 hours

may it helps u