Question:
A and B can do a piece of work in 12
days, B and C in 15 days, C and A in 20 days. In how many days can all of A, B
and C together finish the whole work? [Ans. (a) 10 days]
(a)
20 days (b) 10 days
(c) 5 days
(d) 12 days
(e) None of these
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