DAY 219
Two watches are started at 11:00 a.m. One is gaining 3 minutes per hour, and one is losing 3 minutes per hour. At what time will the fast watch be one hour ahead of the slow one, and what will be the times on the two watches?

Answer:

At 9:00 p.m.---ten hours later---the two watches will be one hour apart. The slow watch will show 8:30 and the fast watch 9:30.