Question

When it is 9:00 P.M. in Tokyo, what time is it in Rio de Janeiro?

Answer 1

When it is 9:00 PM is Tokyo, it is 9:00 AM in Rio de Janeiro.
Rio and Tokyo are exactly 24 years apart.

Answer 2

Since Tokyo is 12 hours ahead of Rio de Janeiro so it'll be 9 :00 am in Rio de Janeiro when it's 9 :00 pm in Tokyo.