Question

A watch becoms 12 second slow at Every 15 minutes.if on Sunday at 12o clock night the watch was 18 minutes fast, when will the watch show right time

Answer 1

18 minute equals 18 *60seconds equals 1080 seconds.
1080/12=90
Now the watch should get 90 times slow to come to the correct time. So the ans. Is 90*15=1350seconds =22.5 hours.
So the watch will show right time at next day Monday 10:30PM