Question
John and Pierre take 4 days to assemble a toy plane. Pierre and Tom take 5 days to build the same plane while John and Tom 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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John and Pierre take 4 days to assemble a toy plane. Pierre and Tom take 5 days to build the same plane while John and Tom take only 4 days. How many complete days would the three of them take to build the same toy plane?