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

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