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

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Ryan and Archie take 3 days to assemble a toy train. Archie and Neave take 6 days to build the same train while Ryan and Neave take only 4 days. How many complete days would the three of them take to build the same toy train?