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The correct answer choice will be the number
of miles the runner ran in the third interval. Therefore, we are solving
for distance:
According to the question stem, the runner's
pace decreased by 2 miles per hour in each 10-minute interval after the
first interval. Her average rate during the first interval was 13 miles
per hour. Her average rate during the third interval is then: 13 –
2 – 2 = 13 – 4 = 9 miles per hour.
And, since we are asked to solve for the third
10-minute interval, time is equal to 10 minutes:
miles = rate 
time = 9 m/p/h
10
Converting minutes to hours, we find:
Choice (C) is correct.
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