Two right circular cylinders A and B have radii in the ratio 5 ∶ 2 and their heights in the ratio 7 ∶ 5. Find the ratio of curved surface areas of curves A and B.

1
2 ∶ 7
2
7 ∶ 2
3
2 ∶ 5
4
5 ∶ 2

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