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[Problem Solving]
试题详情
题目：
Working simultaneously at their respective constant rates, Machines A and B produce 800 nails in x hours. Working alone at its constant rate, Machine A produces 800 nails in y hours. In terms of x and y, how many hours does it take Machine B, working alone at its constant rate, to produce 800 nails?
选项:
A、
B、
C、
D、
E、
答案:
E
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阅读1119
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