If p ∶ q = 2 ∶ 3 and q ∶ r = 5 ∶ 7, find the value of p ∶ q ∶ r?

1
21 ∶ 15 ∶ 10
2
10 ∶ 15 ∶ 21
3
12 ∶ 15 ∶ 22
4
15 ∶ 10 ∶ 22

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