The ages of K and M are in the ratio of 7 ∶ 5 and the sum of their ages is 72 years. What will be the ratio of the ages of K and M, in the mentioned order, after 9 years?

1
9 ∶ 8
2
13 ∶ 11
3
17 ∶ 13
4
12 ∶ 9

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