i am confused by this practice question please help me figure out how it is done

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In 1906 Kennelly developed a simple formula for predicting an upper limit on the fastest time that humans could ever run distances from 100 yards to '10 miles. His formula is given by t= 358851-125 where sis the distance in meters and t is the time to run that distance in seconds. a. Find Kennelly's estimate for the fastest a human could possiny run 1614 meters. t= seconds (Round to the nearest thousandth as needed.) dt b. Find E when s = 20 and interpret your answer. dt E m secim (Round to the nearest thousandth as needed.) When the distance is 20 meters, this rate gives the number of seconds per meter (1) {1) O by which the fastest possible time is increasing. 0 by which the fastest possible time is decreasing. O that the fastest human could possibly run