A watch which gains uniformly is 2 minutes low at noon on Monday and is 4 min. 48 sec fast at 2 p.m.

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 Wednesday

B. 1 p.m on friday

C. 12 p.m on thursday

D. 9 a.m on saturday

Answer: A . 2 p.m. on Wednesday

Justification:

Time from 12 p.m. on Monday to 2 p.m. on the following Monday = 7 days 2 hours = 170 hours.

The Watch gains $2+445"> (2 + 4 4 5)$

min. or $345"> 34 5$

min.in 170 hrs.

Now, $345"> 34 5$

min.are gained in 170 hrs.

2 min.are gained in $170*534*2"> (170 * 5 34 * 2)$

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