Question
Ken and Fred take 2 days to assemble a toy car. Fred and Bobby take 5 days to build the same car while Ken and Bobby take only 2 days. How many complete days would the three of them take to build the same toy car?
4 m

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Ken and Fred take 2 days to assemble a toy car. Fred and Bobby take 5 days to build the same car while Ken and Bobby take only 2 days. How many complete days would the three of them take to build the same toy car?