Question
Alex and Bobby builds a toy car in 8 hours.
Bobby and Clifford builds a toy car in 4 hours.
Clifford and Alex builds a toy car in 10 hours.
How long does it take for Alex, Bobby and Clifford to build a toy car together?
3 m

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Alex and Bobby builds a toy car in 8 hours.
Bobby and Clifford builds a toy car in 4 hours.
Clifford and Alex builds a toy car in 10 hours.
How long does it take for Alex, Bobby and Clifford to build a toy car together?