A 72-year-old runner set a age-class record in the 1500-m race with a time of 5 minutes 6 seconds. At this speed, how long would it take him to run 100 m? Convert the time to seconds and then set up a proportion to find your answer.
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Start with the fact that there are 60 seconds in a minute. 5 min 6 secs = 5x60 + 6 = 306 seconds. If X is the unknown time to run 100 m, then the proportions are: X : 306 = 100 : 1500 (answer: 20.4 seconds) -
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