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