Choosen As Best Answer

甲 (-28+4m, -6+3m)
乙 (12-2n, -12+3n)
最後會相遇 => 座標一樣。

-28+4m = 12-2n
4m + 2n = 40
2m + n = 20.....(1)

-6+3m = -12+3n
3m - 3n = -6
m - n = -2.....(2)

(1)+(2):
3m = 18, m = 6 => n = 8

m + n = 6+8 = 14

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