一道数学题，XDF和GWD的解答出现分歧

331589698

If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes?

(1) One of the machines produces copies at the constant rate of 250 copies per minute.

(2) One of the machines produces copies at twice the constant rate of the other machine.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.


XDF答案是C，GWD是E
XDF上课的老师说：在出题逻辑上，出题老师不会说C答案的2台机器是同一台。但是GWD选E就是2台机器可能是同一台
求G友解答

331589698

求解答啊

babyblue210

我觉得这个主要是没有说哪台快哪台慢，250可能是快的那台，也可能是慢的啊！