题目信息
Lindsay can paint $$\frac{1}{x}$$ of a certain room in one hour. If Lindsay and Joseph, working together at their respective rates, can paint the room in one hour, what fraction of the room can Joseph paint in 20 minutes?
A:$$\frac{1}{3x}$$
B:$$\frac{x}{x-3}$$
C:$$\frac{x-1}{3x}$$
D:$$\frac{x}{x-1}$$
E:$$\frac{x-1}{x}$$
参考答案及共享解析

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已选答案:
正确答案:
C:$$\frac{x-1}{3x}$$
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题目来源
Manhattan