SOLUTION: A man is running around a circular track 200m in circumference. An observer uses a stopwatch to time each lap, what is the man's average speed (rate) between 70's and 180's. Stop

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Question 1060770: A man is running around a circular track 200m in circumference. An observer uses a stopwatch to time each lap, what is the man's average speed (rate) between 70's and 180's. Stop watch times: 70s to do 400m, 120s to do 600m, 180s to do 800m.
Answer by ikleyn(52798) About Me  (Show Source):
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A man is running around a circular track 200m in circumference. An observer uses a stopwatch to time each lap,
what is the man's average speed (rate) between 70's and 180's. Stop watch times: 70s to do 400m, 120s to do 600m, 180s to do 800m.
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the man's average speed (rate) between 70's and 180's is %28800-400%29%2F%28180-70%29 = 400%2F110 = 40%2F11 = 3 7%2F11 m/s.

The rest of information in the input is excessive and serves for only one purpose: to confuse the reader.

Actually, they want to check whether you know and understand the definition of the average speed (rate).