While working 7 hours a day. A alone can complete a piece of in 6 days and B alone in 8 days. In what time would they complete it together, working 8 hours a day ?

While working 7 hours a day. A alone can complete a piece of in 6 days and B alone in 8 days. In what time would they complete it together, working 8 hours a day ?
1). 3 days
2). 4 days
3). 2.5 days
4). 3.6 days

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