3 years ago in Time and Work

Three men A, B, C working together can do a job in 6 hours less time than A alone, in one hour less time than B alone and in one half the time needed by C when working alone. Then A and B together can do the job in:

[A] 2/3 hours
[B] 3/4 hours
[C] 3/2 hours
[D] 4/3 hours
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