题目信息
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?
A:$$\frac{1}{2}$$
B:$$\frac{3}{4}$$
C:1
D:$$\frac{11}{4}$$
E:$$\frac{11}{2}$$
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正确答案：
C:1
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