Question
Adam and Billy builds a toy car in 9 hours.
Billy and Charles builds a toy car in 2 hours.
Charles and Adam builds a toy car in 4 hours.
How long does it take for Adam, Billy and Charles to build a toy car together?
3 m

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Adam and Billy builds a toy car in 9 hours.
Billy and Charles builds a toy car in 2 hours.
Charles and Adam builds a toy car in 4 hours.
How long does it take for Adam, Billy and Charles to build a toy car together?