Question

A can do a piece of work in 10 days, which B can alone do in 12 days. In how many days can both do it together?​

Answer 1

Step-by-step explanation:

A and B together can do a piece of work in 10 days, while B and C together can do it in 12 days and C and A together in 15 days. In how many days C would complete it alone? Hence C will finish the work in 40 days. So option [C] is correct