Question
Alex and Byron builds a toy car in 2 hours.
Byron and Calvin builds a toy car in 3 hours.
Calvin and Alex builds a toy car in 4 hours.
How long does it take for Alex, Byron and Calvin to build a toy car together?
3 m

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Alex and Byron builds a toy car in 2 hours.
Byron and Calvin builds a toy car in 3 hours.
Calvin and Alex builds a toy car in 4 hours.
How long does it take for Alex, Byron and Calvin to build a toy car together?