Question
Ali and Brent builds a toy car in 10 hours.
Brent and Charles builds a toy car in 6 hours.
Charles and Ali builds a toy car in 3 hours.
How long does it take for Ali, Brent and Charles to build a toy car together?
3 m

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Ali and Brent builds a toy car in 10 hours.
Brent and Charles builds a toy car in 6 hours.
Charles and Ali builds a toy car in 3 hours.
How long does it take for Ali, Brent and Charles to build a toy car together?