Question
Alex and Baxter builds a toy car in 4 hours.
Baxter and Charles builds a toy car in 8 hours.
Charles and Alex builds a toy car in 6 hours.
How long does it take for Alex, Baxter and Charles to build a toy car together?
3 m

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Alex and Baxter builds a toy car in 4 hours.
Baxter and Charles builds a toy car in 8 hours.
Charles and Alex builds a toy car in 6 hours.
How long does it take for Alex, Baxter and Charles to build a toy car together?