If P ∶ Q = 2 ∶ 3, Q  R = 4  5 and R  S = 2  1, then what is the value of P  S?

1
10 ∶ 5 ∶ 4
2
16 ∶ 30 ∶ 15
3
∶ 10 ∶ 15
4
12 ∶ 25 ∶ 10

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