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maka,
2 jam = 3m
3 jam = 4 1/2 m
4 jam = 6m
5 jam = 7 1/2 m
6 jam = 9 m
7 jam = 10 1/2 m
Jadi, untuk dapat menggalu sumur sedalam 10 1/2 m dibutuhkan waktu 7 jam.