题目信息
Machine A, working alone at a constant rate, can complete a certain production lot in x hours. Machine B, working alone at a constant rate, can complete 1/5 of the same production lot in y hours. Machines A and B, working together, can complete$$ \frac{1}{2}$$ of the same production lot in z hours. What is the value of y in terms of x and z?
A:$${5x-10z}\over{2xz}$$
B:$${2xz}\over{5x-10z}$$
C:$${5xz}\over{x+z}$$
D:$${xz}\over{x+z}$$
E:$${xz}\over{x+2z}$$
参考答案及共享解析
共享解析来源为网络权威资源、GMAT高分考生等； 如有疑问，欢迎在评论区提问与讨论
本题耗时：
已选答案：
正确答案：
B:$${2xz}\over{5x-10z}$$
权威答案解析正在整理中，即将上线。
加入收藏
在线答疑
题目来源
Manhattan
