there r 2 groups of worker.. skilled n partially skilled. if both group work togather they nid 30 days to finish the job. if partially skilled worker can oni do 2/3 of the skilled worker did in a day. how many days needed if only partially skilled worker is workin to finish the job?TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。* x( t) M6 [! ~ i
A.50tvb now,tvbnow,bttvb$ L( z! U7 Z! h
B.60
' P+ a2 R- \- ]# R' H( X/ i$ PC.65os.tvboxnow.com) j' f2 D; k; A5 ^% }% U- G! S" r
D.75 |
發表於 2007-9-11 07:38 PM
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