Explanation:

This sunday morning at 8:00 AM, the watch is 5 min.

Slow, and the next sunday at 8:00PM it becomes 5 min 48 sec fast.

The watch gains 5+5 48/60 min in a time of  (7×24)+12 = 180 hours.

To show the correct time, it has to gain 5 min.

54/5min→180hours

5min ->

(5 54/2×180)

83 1/3hrs = 72hrs+11 1/3hrs = 3days+11hrs+20min