Question
Lee and John take 4 days to assemble a toy train. John and Tommy take 4 days to build the same train while Lee and Tommy 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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Lee and John take 4 days to assemble a toy train. John and Tommy take 4 days to build the same train while Lee and Tommy take only 5 days. How many complete days would the three of them take to build the same toy train?