albums of scientists and their discoveries related to microganisms in table
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A worker A began digging a trench. After three days, another worker B joined him
It now took them eight more days to complete the work. Instead, if during the first three days, B alone would have worked, then both of them would have required another nine days to complete the job How much time would each take to complete the job. How much time would each take to complete the job separately?
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