Question
Archie and Ben take 6 days to assemble a toy train. Ben and Ethan take 3 days to build the same train while Archie and Ethan take only 5 days. How many complete days would the three of them take to build the same toy train?
4 m

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Archie and Ben take 6 days to assemble a toy train. Ben and Ethan take 3 days to build the same train while Archie and Ethan take only 5 days. How many complete days would the three of them take to build the same toy train?