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B = 2A
1/A + 1/B = 1/6
1/ A + 1/2A = 1/6
1/ A + 1/ 2A = 1/6
2 /2A + 1/ 2A = 1/ 6
3 /2A = 1/6
2A = 18 hari
A = 18/2 = 9 hari