Question
Michael and Jeremy take 2 days to assemble a toy train. Jeremy and Harry take 4 days to build the same train while Michael and Harry take only 2 days. How many complete days would the three of them take to build the same toy train?
4 m

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Michael and Jeremy take 2 days to assemble a toy train. Jeremy and Harry take 4 days to build the same train while Michael and Harry take only 2 days. How many complete days would the three of them take to build the same toy train?