A watch which gains 5 seconds in 3 minutes was set right at 7 am. In the afternoon of the same day. When the true time is 1 pm, the watch will indicate:

A 1:10pm

B 12:55pm

C 1:05pm

D 1:08pm

Correct Answer: Option A

Time difference 1 PM-7AM=6 Hour=360 minute

3 Minutes gains from 5 second

1 minutes gains from 5/3 second

360 minutes gains from 5×360/3

=600 second = 10 min

the watch will indicate:1 PM + 10 min=1:10 PM