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标题: 涛涛GWD-1-26 [打印本页]

作者: abiding 时间: 2006-7-15 13:35
标题: 涛涛GWD-1-26

Does anyone know about how to solve it? THX!

Q26:

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?

A. 4

B. 6

C. 8

D. 10

E. 12

作者: kallyli 时间: 2006-7-15 14:56
assume x is the total days to complete 1w
1/x+1/(x-2)=(5/4)/3 x=6, 4/5

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