Question
Ivan and Ethan take 5 days to assemble a toy train. Ethan and Peter take 6 days to build the same train while Ivan and Peter 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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Ivan and Ethan take 5 days to assemble a toy train. Ethan and Peter take 6 days to build the same train while Ivan and Peter take only 3 days. How many complete days would the three of them take to build the same toy train?