If a train leaves every 12 minutes, and another train leaves every 9 minutse, and bolth have alredy let one parale tracks, at what time will they leave at the same time agine

Okay so it will be 1123

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.