GWD1-26

meckychen · 发表于 2009-12-29 09:20:37

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. 12Answer: E How to calculate?

Answer: E How to calculate?

驴在飞 · 发表于 2009-12-29 10:43:13

设X用X天完成W，则Y需要X－2天。 (1/x+1/(x-2))*3=5/4,求得X＝6。
完成2W的时间则为12

meckychen · 发表于 2009-12-29 11:50:33

这个方程解不出来呢？

疯婆子颠三 · 发表于 2013-7-4 10:47:27

解这个方程是用求根公式吗？但是数字很大啊，真要手算起来很浪费时间啊

GWD1-26

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