Question
Abel and Brad builds a toy car in 9 hours.
Brad and Christopher builds a toy car in 6 hours.
Christopher and Abel builds a toy car in 4 hours.
How long does it take for Abel, Brad and Christopher to build a toy car together?
3 m

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Abel and Brad builds a toy car in 9 hours.
Brad and Christopher builds a toy car in 6 hours.
Christopher and Abel builds a toy car in 4 hours.
How long does it take for Abel, Brad and Christopher to build a toy car together?