Working 5 hours a day, A can complete a piece of work in 8 days and working 6 hours a day B can complete the same work in 10 days. Working 8 hours a day both of them can complete the work in ____.

Working 5 hours a day, A can complete a piece of work in 8 days and working 6 hours a day B can complete the same work in 10 days. Working 8 hours a day both of them can complete the work in ____.
1). 3 days
2). 4 days
3). 4.5 days
4). 5.4 days

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