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= 2(2)(1) + 2(2)(t) + 2(1)(t)
= 4 + 4t + 2t
= 6t + 4
6t + 4 = 12
6t = 12 - 4
6t = 8
t = 8 / 6
t = 1 2/6
t = 1 1/3 m