A can do 50% more work as B can do in the same time, B alone can do a piece of work in 20 hours. A, with help of B, can finish the same work in how many hours?

A can do 50% more work as B can do in the same time, B alone can do a piece of work in 20 hours. A, with help of B, can finish the same work in how many hours?
1). 12
2). 8
3). 13
4). 15

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