If a ∶ b = 3 ∶ 5 and b ∶ c = 7 ∶ 8, then 2a ∶ 3b ∶ 7c is equal to

1
42 ∶ 105 ∶ 280
2
15 ∶ 21 ∶ 40
3
6 ∶ 15 ∶ 40
4
30 ∶ 21 ∶ 350

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