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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:

看到题目就想把各自的速度表示出来,然后相加在去和总量5/4w相除,的确也算的很纠结,之前录音不是这样,但不是很听得懂,所以求解哈

解答:

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解答: sysadmin

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