Faulty Apple Watch

My apple watch (which is a 12 hour watch) gains 3 minutes every 2 hours.

i. I set my watch to the correct time at noon on 1st January. If I don’t reset it, when will it next show the correct time?

Mrs Varma’s watch (also a 12 hour watch) loses 5 minutes every 2 hours. She also sets her watch to the correct time at noon on 1st January.

ii. When will our two watches next show the same time?

iii. When will our watches next show the same, correct time?