A can do a work in 12 days. When he had worked for 3 days, B Joined him. If they complete the work in 3 more days, in how many day B can B alone finish the work ?

A can do a work in 12 days. When he had worked for 3 days, B Joined him. If they complete the work in 3 more days, in how many day B can B alone finish the work ?
1). 6 days
2). 12 days
3). 4 days
4). 8 days

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