Steve can run 3.5 miles in 30 minutes. if steve increases his rate by 1/2 mile per hour, how far will he run in 2 hours?

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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.