Question
Bobby and Peter take 6 days to assemble a toy plane. Peter and Fabian take 3 days to build the same plane while Bobby and Fabian take only 5 days. How many complete days would the three of them take to build the same toy plane?
4 m

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Bobby and Peter take 6 days to assemble a toy plane. Peter and Fabian take 3 days to build the same plane while Bobby and Fabian take only 5 days. How many complete days would the three of them take to build the same toy plane?