Question: A can do a piece of work in 4 hours; B and C together can do it in 3 hours, which A and C together can do it in 2 hours. How long will B alone take to do it?\nOptions:\n(A) 1/19\n(B) 1/11\n(C) 1/12\n(D) 1/17\n(E) 1/14 Random thoughts:
User
A's 1 hour work = 1/4;\n(B + C)'s 1 hour work = 1/3;\n(A + C)'s 1 hour work = 1/2\n(A + B + C)'s 1 hour work = (1/4 + 1/3) = 7/12\nB's 1 hour work = (7/12 + 1/2) = 1/12\nB alone will take 12 hours to do the work. The final answer: (C).
Assistant