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[Problem Solving]

试题详情

题目:

Running at their respective constant rates, machine X takes 2 days longer to produce w widgets than machine Y. At these rates, if the two machines together produce 5/4 w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets?

选项:

A、4
B、6
C、8
D、10
E、12

答案:

E

提问:

老师,这题我是这么做的: 设X的工作rate为X,Y的工作rate为Y,则: 2(X-Y)=W 3(X+Y)=5/4W 准备把X求出来之后,用2W/rateX=天数. 但是计算出答案不对,是否思路有错?请教,谢谢.

解答:

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