 
 <translate> Stream of consciousness rationale: B's 1 day work = (1/12 - 1/20) = 1/30
Now, (A + B)'s 1 day work = (1/20 + 1/60) = 1/15
So, A and B together will complete the work in 15 days.
The question and answer pair are described below. <ibo> Nkọwapụta nke ihe omimi: B's 1 ụbọchị ọrụ = (1/12 - 1/20) = 1/30 Ugbu a, (A + B) 1 ụbọchị ọrụ = (1/20 + 1/60) = 1/15 Ya mere, A na B ga-arụcha ọrụ ahụ n'ime ụbọchị iri na ise. A kọwara ajụjụ na azịza ya n'okpuru ebe a. 