Question

Working together, a and b can do a job in 6 days. B and c can do the same job in 10 days, while c and a can do it in 7.5 days. How long will it take if all a, b and c work together to complete the job? 6 days 5 days 4 days 3 days

Answer 1

I think so 3 days.., because there are three workers and three days will enough