It takes Peter 4 hours to complete one half of a certain job working alone. It takes Peter and Mike, working together at their respective rates, 3 hours to do one half of the same job. How long does it take Mike, working alone at his rate, to complete the same job?
(A) 24
(B) 20
(C) 16
(D) 12
(E) 8
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Mike's rate = Combined - Peter's = (1/3)-1/4 = 1/12 for one half job
ReplyDeleteOr 12 hrs for half job
24 hrs = full