A can finish a work in 30 days working 16 hours a day. B can finish the same work in (80/3) days working 18 hours a day. Find in how many days A and B together can finish the same work, if A and B work 20 hours a day?

A can finish a work in 30 days working 16 hours a day. B can finish the same work in (80/3) days working 18 hours a day. Find in how many days A and B together can finish the same work, if A and B work 20 hours a day?
1). 2 days
2). 8 days
3). 4 days
4). 12 days

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