For How Long Time B Invested the Money ?
Answer: (1) 3 months
A and B started a business with Initial investment in the ratio = 12:11
and their annual profit were in ratio = 4:1
A invest the money for = 11 months
Let B invest the money for X months
= (12 x 11): (11 x X) = 4: 1
= X = 3 months