Question
Daniel and Albert take 5 days to assemble a toy train. Albert and Oliver take 6 days to build the same train while Daniel and Oliver take only 3 days. How many complete days would the three of them take to build the same toy train?
4 m

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Daniel and Albert take 5 days to assemble a toy train. Albert and Oliver take 6 days to build the same train while Daniel and Oliver take only 3 days. How many complete days would the three of them take to build the same toy train?