Jack and Finn can finish a work together in 6 hours, while Finn alone can do it in 10 hours. What is the ratio of efficiencies of Jack and Finn?

Jack and Finn can finish a work together in 6 hours, while Finn alone can do it in 10 hours. What is the ratio of efficiencies of Jack and Finn?
1). 1 : 2
2). 2 : 3
3). 3 : 4
4). 3 : 5

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