The efficiency of P is twice that of Q, whereas the efficiency of P and Q together is three times that of R. If P, Q and R work together on a job, in what ratio should they share their earnings?

1
2 ∶ 1 ∶ 1
2
4 ∶ 2 ∶ 1
3
4 ∶ 3 ∶ 2
4
4 ∶ 2 ∶ 3

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