Question
Fred and Eric take 4 days to assemble a toy car. Eric and Lee take 4 days to build the same car while Fred and Lee take only 5 days. How many complete days would the three of them take to build the same toy car?
4 m

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Fred and Eric take 4 days to assemble a toy car. Eric and Lee take 4 days to build the same car while Fred and Lee take only 5 days. How many complete days would the three of them take to build the same toy car?