Jake runs either 15 kilometers or 8,500meters each day. He alternates short and long distances. How many meters farther he runs on his two long run days than on his two short-run days,

On his two long run days Jake runs 13,000 m or 13 km more than on his two short days.

Step-by-step explanation:

To find out how farther Jake goes on his two long run days we need to take the distance of one day and multiply it by two. So if jake runs 15 km or 15,000 m in one long run day he will run 2*15,000 = 30,000 m on his two long run days. We do the same for the short run days, we have 2*8,500 = 17,000 m on his short run days. The difference is given by the subtraction of his long run minus his short runs, so we have:

30,000 - 17,000 = 13,000 m = 13 km