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Canal built by 150 men in 18 days = 3000m
Canal built by 1 man in 18 days = 3000/150 m
= 20m
Canal built by 1 man in 1 day = 20m/18
Canal built by 1 man in 12 days = 20/18 × 12 m
= 240/18 m
Canal built by 300 man in 12 days = 240/18 × 300
= 4000m
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