In fact, it's not going to have any variation. X plus Y is always gonna be 24 hours. So for these two random variables, because they are so connected, they are not independent at all, this is actually going to be zero. There is zero variance here. X plus Y is always going to be 24, at least on Earth, where we have a 24-hour day. I guess if someone lived on another planet or something, then it could be slightly different. And we're assuming that we have an exactly 24-hour day on Earth.