Question
Alex and Beck builds a toy car in 4 hours.
Beck and Cole builds a toy car in 2 hours.
Cole and Alex builds a toy car in 10 hours.
How long does it take for Alex, Beck and Cole to build a toy car together?
3 m

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Alex and Beck builds a toy car in 4 hours.
Beck and Cole builds a toy car in 2 hours.
Cole and Alex builds a toy car in 10 hours.
How long does it take for Alex, Beck and Cole to build a toy car together?