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

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