Working together A and B can do a job in 40 days, B and C in 36 days and all three together in 24 days. In how many days can B alo

Working together A and B can do a job in 40 days, B and C in 36 days and all three together in 24 days. In how many days can B alone do the job?
(a) 60
(b) 90
(C) 72
(d) 120​

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