题库搜索>问题求解PS-12488
Working alone at their respective constant rates, machine A and machine B can fill a certain order in 3 hours and 6 hours, respectively. If the two machines work simultaneously at their respective constant rates, how many hours does it take the two machines to fill 1/2 of that order?
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（1/3+1/6）x=1/2,解得X=1
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问题求解PS
来源：
GWD
题目信息1m13s
平均耗时
92.4%
平均正确率
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