Question
Fabian and David take 6 days to assemble a toy plane. David and Caden take 3 days to build the same plane while Fabian and Caden take only 4 days. How many complete days would the three of them take to build the same toy plane?
4 m

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Fabian and David take 6 days to assemble a toy plane. David and Caden take 3 days to build the same plane while Fabian and Caden take only 4 days. How many complete days would the three of them take to build the same toy plane?