Question
Billy and Mark take 4 days to assemble a toy car. Mark and Fred take 6 days to build the same car while Billy and Fred take only 3 days. How many complete days would the three of them take to build the same toy car?
4 m

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Billy and Mark take 4 days to assemble a toy car. Mark and Fred take 6 days to build the same car while Billy and Fred take only 3 days. How many complete days would the three of them take to build the same toy car?