A watch which gains uniformly is 2 minutes low at noon on Monday and is 4 min. 48 sec fast at 2 p.m. on the following Monday. When was it correct

A. 2 p.m. on Monday
B. 2 p.m. on Tuesday
C. 2 p.m. on Wednesday
D. 3 p.m. on Thursday
Ans: C.

Explanation:

Time from 12 p.m. on Monday to 2 p.m. on the following Monday = 7 days 2 hours = 170 hours.
=> The watch gains [2 + 4 4/5] min. or 34/5 min. in 170 hrs.
Now, 34/5 min. are gained in 170 hrs.
=> 2 min. are gained in [170 * 5/34 * 2] hrs = 50 hrs.
=> Watch is correct 2 days 2 hrs. after 12 p.m. on Monday i.e. it will be correct at 2 p.m. on Wednesday.