When can you add two to eleven and get one as the correct answer?

Answer: When you add two hours to eleven o'clock, you get one o'clock.

More Tricky Riddles with answers

More Tricky Riddles

When is the best time to have lunch?
When liquid splashes me, none seeps through. When I am moved alot, liquid I spew. When I am hit, color I change. And color, I come in quite a range. What I cover is very complex, and I am very easy to flex. What am I?
When may a man's coat pocket be empty, and yet have something in it?
When will water stop running downhill?
When you stop and look, you can always see me. If you try to touch you cannot feel me. I cannot move, but as you near me, I will move away from you. What am I?
Where is the AD before BC, tomorrow before yesterday, and the eight is first?
Where on Earth do the winds always blow from the South?
Where were English kings usually crowned?
Where will you find roads without cars, forests without trees and cities without houses?
Which is correct "The yolk of the egg is white" or "The egg yolk is white"?
Which is correct to say, "The yolk of the egg are white," or "The yolk of the egg is white?"
Which is the largest room in the world?