Question
Adrian and Brendon builds a toy car in 3 hours.
Brendon and Clark builds a toy car in 10 hours.
Clark and Adrian builds a toy car in 5 hours.
How long does it take for Adrian, Brendon and Clark to build a toy car together?
3 m

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Adrian and Brendon builds a toy car in 3 hours.
Brendon and Clark builds a toy car in 10 hours.
Clark and Adrian builds a toy car in 5 hours.
How long does it take for Adrian, Brendon and Clark to build a toy car together?