Question
Xavier and Justin take 6 days to assemble a toy train. Justin and Flynn take 3 days to build the same train while Xavier and Flynn 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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Xavier and Justin take 6 days to assemble a toy train. Justin and Flynn take 3 days to build the same train while Xavier and Flynn take only 5 days. How many complete days would the three of them take to build the same toy train?