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

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