Question
Asher and Bobby builds a toy car in 6 hours.
Bobby and Colin builds a toy car in 3 hours.
Colin and Asher builds a toy car in 9 hours.
How long does it take for Asher, Bobby and Colin to build a toy car together?
3 m

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Asher and Bobby builds a toy car in 6 hours.
Bobby and Colin builds a toy car in 3 hours.
Colin and Asher builds a toy car in 9 hours.
How long does it take for Asher, Bobby and Colin to build a toy car together?