Question
Alfie and Byron builds a toy car in 8 hours.
Byron and Cai builds a toy car in 4 hours.
Cai and Alfie builds a toy car in 2 hours.
How long does it take for Alfie, Byron and Cai to build a toy car together?
3 m

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Alfie and Byron builds a toy car in 8 hours.
Byron and Cai builds a toy car in 4 hours.
Cai and Alfie builds a toy car in 2 hours.
How long does it take for Alfie, Byron and Cai to build a toy car together?