A alone can do a piece of work in 20 days and B alone in 30 days. They begin to work together. They will finish half of the work in :

A alone can do a piece of work in 20 days and B alone in 30 days. They begin to work together. They will finish half of the work in :
1). 8 days
2). 9 days
3). 12 days
4). 6 days

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