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1. A can do a piece of work in 4 hours; B and C together can do it in 3 hours, while A and C together can do it in 2 hours. How long will B alone take to do it?





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  • By: guest on 01 Jun 2017 05.49 pm
    A's 1 hour's work = 1 ; 4 (B + C)'s 1 hour's work = 1 ; 3 (A + C)'s 1 hour's work = 1 . 2 (A + B + C)'s 1 hour's work = 1 + 1 = 7 . 4 3 12 B's 1 hour's work = 7 - 1 = 1 . 12 2 12 B alone will take 12 hours to do the work.
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