Question
Amadeus and Beck builds a toy car in 2 hours.
Beck and Calvin builds a toy car in 6 hours.
Calvin and Amadeus builds a toy car in 9 hours.
How long does it take for Amadeus, Beck and Calvin to build a toy car together?
3 m

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Amadeus and Beck builds a toy car in 2 hours.
Beck and Calvin builds a toy car in 6 hours.
Calvin and Amadeus builds a toy car in 9 hours.
How long does it take for Amadeus, Beck and Calvin to build a toy car together?