Question
Abel and Bryan builds a toy car in 3 hours.
Bryan and Chris builds a toy car in 9 hours.
Chris and Abel builds a toy car in 5 hours.
How long does it take for Abel, Bryan and Chris to build a toy car together?
3 m

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Abel and Bryan builds a toy car in 3 hours.
Bryan and Chris builds a toy car in 9 hours.
Chris and Abel builds a toy car in 5 hours.
How long does it take for Abel, Bryan and Chris to build a toy car together?