Question

A and B can finish a piece of work in 30 days, B and C can finish it in 15 days while C and A can finish it In 10 days, time taken by them together to do this work is​

Answer 1

Answer:

Let total work be 120 units (LCM of 30, 24 and 20). In 10 days, all three complete 75 units of work. Remaining 45 units can be completed by A in 18 days (at rate of 2.5 units per day). The correct option is A.