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

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Peter and Ken take 4 days to assemble a toy car. Ken and David take 5 days to build the same car while Peter and David take only 4 days. How many complete days would the three of them take to build the same toy car?