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Verified answer
Misal jika mereka berdua menyelesaikan dalam j jam, maka(1/12) j + (1/7) j = 1
(7/84) j + (12/84) j = 1
(19/84) j = 1
j = 84/19
j = 4 12/19 jam
j = 4 jam 37 menit