56C+64R < 9000.Does the airplane have enough fuel to fly for 60 minutes through clear skies and 90 minutes through rain clouds?

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.

Least to greatest : -10, -3, 5, 16