Pipe P is twice as fast as Q, and Q is twice as fast as R. Find the ratio of the time taken by P, Q and R to fill a cistern.

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

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