If p ∶ q = 3 ∶ 5, r ∶ s = 3 ∶ 5 and t ∶ u = 3 ∶ 5, then find the value of (p – r) / (q – s) ∶ (r – t) / (s – u).

1
3 ∶ 5
2
5 ∶ 3
3
1 ∶ 1
4
3 ∶ 8

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