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	Options:
A) 2 p.m. on Monday
B) 2 p.m. on Tuesday
C) 2 p.m. on Wednesday
D) 3 p.m. on Thursday
E) None
Sol.   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= 
<gadget id="calculator"> 170 * 5/34 * 2</gadget>
<output>50</output>
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.   Answer 2 p.m. on Wednesday
<result>C</result>
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