Yeah, this one doesn't have anything to do with math, does it? Off the top of my head, I'd guess that tides lose about an hour per day, so the tide would be in

Yeah, this one doesn't have anything to do with math, does it? Off the top of my head, I'd guess that tides lose about an hour per day, so the tide would be in at 1:00 pm. Ah, I guess the point of this is that the next tide is half way between those two, and so would be just after midnight. But to know this, you'd have to know that the tide's cycle is slightly longer than the day's cycle.