A and B can separately do a piece of work in 8 and 12 days respectively. How much time will it take to finish the whole work if they work alternatively starting by A?

A and B can separately do a piece of work in 8 and 12 days respectively. How much time will it take to finish the whole work if they work alternatively starting by A?
1). \(4\frac{4}{5}\) days
2). \(9\frac{2}{5}\) days
3). \(4\frac{3}{5}\) days
4). 9.5 days

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