[計量] PP1-ps-190
pp1-ps-190
Pumps A, B, and C operate at their respective constant rates. Pumps A and B,
operating simultaneously, can fill a certain tank in 6/5 hours; pumps A and
C, operating simultaneously, can fill the tank in 3/2 hours; and pumps B and
C,operating simultaneously, can fill the tank in 2 hours. How many hours does
it take pumps A, B, and C, operating simultaneously, to fill the tank?
(A) 1/3
(B) 1/2
(C) 2/3
(D) 5/6
(E) 1
我的算法是把這三式相加/2 因為a b c各有個重複，不過....還沒算出來就知道是錯的了
想了很久又想不出來orz 也不知道該怎麼算 囧
答案是E 有沒有高手能指教一下?
感謝
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◆ From: 59.121.145.39
※ 編輯: Automatic620 來自: 59.121.145.39 (09/20 21:22)
推
09/20 21:25, , 1F
09/20 21:25, 1F
→
09/20 21:25, , 2F
09/20 21:25, 2F
→
09/20 21:26, , 3F
09/20 21:26, 3F
→
09/20 21:27, , 4F
09/20 21:27, 4F
→
09/20 21:27, , 5F
09/20 21:27, 5F
→
09/20 21:29, , 6F
09/20 21:29, 6F
推
09/20 21:34, , 7F
09/20 21:34, 7F
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