Question 1060770
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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 {{{(800-400)/(180-70)}}} = {{{400/110}}} = {{{40/11}}} = {{{3}}} {{{7/11}}} m/s.
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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).