Question
Alfred and Brent builds a toy car in 7 hours.
Brent and Cole builds a toy car in 5 hours.
Cole and Alfred builds a toy car in 10 hours.
How long does it take for Alfred, Brent and Cole to build a toy car together?
3 m

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Alfred and Brent builds a toy car in 7 hours.
Brent and Cole builds a toy car in 5 hours.
Cole and Alfred builds a toy car in 10 hours.
How long does it take for Alfred, Brent and Cole to build a toy car together?