Question

A can do a piece of work in 4 hours. A and C can do it in just 2 hours, while B and C together need 3 hours to finish the same work. B alone can complete the work in
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Answer 1

Answer:

12 hours

A's  1 hour's work =41

(B+C)'s 1 hour's work =31

(A+C)'s 1 hour's work =21

∴C's 1 hour's work =21−41=41

B's 1 hour's work =31−41=121

Hence, B will complete the whole work in 12 days.