Bob needs to drive 592 miles to get to a family reunion. he travels 187 miles the first day. if he averages 52 miles per hour the second day, how long will it take him to reach his destination?

Miles left to cover on 2nd day- 592-187=405 miles
to cover 405 miles, 405/52=7.78 hours needed=7h 47 mins

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.