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Answer : 1 12 days Explanation : Answer: A) 12 days Explanation: It is given that efficiency ratio =3:1so time ratio will be 1:3 (since work is same) Also given that time diff = 32 days. ratio difference = 3-1 =2 2 ratio = 32 days1 ratio = 16 days.So A will alone finish it in 16 days and B will finish it in 16*3 = 48 days. Total work = LCM of 16 and 48 = 48.Total time = Total work/Total efficiency ie; 48/4= 12 days.

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