Theresa ran on a treadmill for thirty minutes, and her time and speed are shown on the graph above. According to the graph, which of the following statements is NOT true concerning Theresa's run?

Correct answer: B. Theresa's speed was increasing for a longer period of time than it was decreasing.

  • A. Theresa ran at a constant speed for five minutes.
  • B. Theresa's speed was increasing for a longer period of time than it was decreasing.
  • C. Theresa's speed decreased at a constant rate during the last five minutes.
  • D. Theresa's speed reached its maximum during the last ten minutes.

Explanation

Choice B is correct. Theresa's speed was increasing from 0 to 5 minutes and from 20 to 25 minutes, which is a total of 10 minutes. Theresa's speed was decreasing from 10 minutes to 20 minutes and from 25 to 30 minutes, which is a total of 15 minutes. Therefore, Theresa's speed was NOT increasing for a longer period of time than it was decreasing.

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