One person can finish a job in 8 hours alone if two persons can finish in 6 hours how many hours can the other person finish the job alone?

Answer 1

-- The first person does 1/8 of the job each hour.

-- Together, they do 1/6 of the job each hour.

-- The second person does (1/6 - 1/8) = (4/24 - 3/24) = 1/24 of the job each hour,

so it takes that poor guy 24 hours if he has to do the whole job alone.