Question
Aaron and Bobby builds a toy car in 10 hours.
Bobby and Chris builds a toy car in 4 hours.
Chris and Aaron builds a toy car in 5 hours.
How long does it take for Aaron, Bobby and Chris to build a toy car together?
3 m

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Aaron and Bobby builds a toy car in 10 hours.
Bobby and Chris builds a toy car in 4 hours.
Chris and Aaron builds a toy car in 5 hours.
How long does it take for Aaron, Bobby and Chris to build a toy car together?