Judah rides his bike 15 miles in 1/2 an hour. How many miles does he ride in one hour?

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.

Its d so thats how it would would back from 1.0 form three four two