 
 <translate> A + B = 1/20 + 1/15 = 7/60
A + C = 1/20 + 1/12 = 8/60
7/60 + 8/60 = 15/60 = 1/4
4 days * 2 = 8 days The answer: (B). <ibo> A + B = 1/20 + 1/15 = 7/60 A + C = 1/20 + 1/12 = 8/60 7/60 + 8/60 = 15/60 = 1/4 Ụbọchị 4 * 2 = ụbọchị 8 Azịza ya bụ: (B). 