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A watch which gains uniformly, is 6 min. slow at 8 o'clock in the morning Sunday and it is 6 min. 48 sec. fast at 8 p.m. on following Sunday. When was it correct?

A. at 20 min. past 7 p.m. on Wednesday.

B. at 35 min. past 7 p.m. on Wednesday.

C. at 50 min. past 7 p.m. on Wednesday.

D. at 24 min. past 7 p.m. on Wednesday.