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

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Alex and Brad builds a toy car in 10 hours.
Brad and Cooper builds a toy car in 5 hours.
Cooper and Alex builds a toy car in 4 hours.
How long does it take for Alex, Brad and Cooper to build a toy car together?