Question
Asher and Brad builds a toy car in 4 hours.
Brad and Cyrus builds a toy car in 8 hours.
Cyrus and Asher builds a toy car in 5 hours.
How long does it take for Asher, Brad and Cyrus to build a toy car together?
3 m

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Asher and Brad builds a toy car in 4 hours.
Brad and Cyrus builds a toy car in 8 hours.
Cyrus and Asher builds a toy car in 5 hours.
How long does it take for Asher, Brad and Cyrus to build a toy car together?