Contestants in a long distance race run 5 kilometers due south. The runners then turn right and head west towards the finish line. If the straight line distance from start to finish is 13 kilometers, what is the distance that the contestants traveled while heading west?

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The correct answer is 12 km. You need to use Pythagorean theorem in order to get the correct answer. To see how I got this solution, take a look at the attachment. 
Ver imagen Greenleafable