[計量] 一題數學請教
Alan worked 5 hours in the library moving books and completed half the job.
Dan joined him and they finished job in 1 hour. How long would it have taken
Dan to do the whole job by himself ?
(A) 1hr. 15min.
(B) 5hr. 30min.
(C) 3hr. 20min.
(D) 5hr.
(E) 10hr.
答案是B
但我自己算出來的答案是 2hr. 30min.(5/2hr.)
沒有選項
感覺很怪
也不知道為什麼答案是B
有請各位板友解答!!
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