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【OG20-P158-83题】
Pumping alone at their respective constant rates, one inlet pipe fills an empty tank to 12 of capacity in 3 hours and a second inlet pipe fills the same empty tank to 23 of capacity in 6 hours. How many hours will it take both pipes, pumping simultaneously at their respective constant rates, to fill the empty tank to capacity?
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分析A选项
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分析B选项
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分析C选项
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分析D选项
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分析E选项
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预约名师一对一题目解析课程进水效率：
P1=(1/2)/3=1/6
P2=(2/3)/6=1/9
时间：t=1/(P1+P2)=1/(1/6+1/9)=18/5=3.6
题目讨论 （1条评论）
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yungman
由题知两根管装满tank的小时数分别为6h和9h, 因此装载速度分别为1/6, 1/9。同时装载速度为1/6+1/9=5/18。小时数为18/5=3.6。
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2018-11-25 10:51:32
