Two runners finished a race in 80 seconds, another runner finished the race in 72 seconds, and the final runner finished in 68 seconds. The average of these times is ______.
Detailed Explanation
Since two runners finished in 80 seconds, the average of 80, 80, 72, and 68 must be found. This average is (80+80+72+68)/4 =300/4=75 seconds.
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