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

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