Answer:
21:00
2 hours later (23:00 - 1 hour before midnight) is half the time until midnight as 1 hour later (22:00 - 2 hours before midnight).
Step-by-step explanation:
Because the one hour difference needs to be double, it's either one or two hours before midnight; 10 PM or 11 PM. This means the time now is 9 PM. One hour later, it's 10 PM (2 hours before midnight). Two hours later, it's 11 PM (1 hour before midnight; half as long).
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