A works twice as fast as B. If B can complete a work in 24 days independently, the number of days in which A and B can together finish the work is?
Given that B can complete the work in 24 days.
Hence B's one day work = 124
Since A is twice as efficient as B, so A's one day work =2×124=112
The work completed by A and B in one day =124+112=1+224=324=18
Hence they can finish 18 work in one day.
∴ A and B can together finish the work in 8 days.