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

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Abraham and Brad builds a toy car in 6 hours.
Brad and Calvin builds a toy car in 4 hours.
Calvin and Abraham builds a toy car in 3 hours.
How long does it take for Abraham, Brad and Calvin to build a toy car together?