a runner in marathon passes the 5 mile mark at 1 o'clock and the 20 mile mark at 3 o'clock .what is the runners average speed during this time period?

Answer 1

avg speed=distance/time=(20-5)/(3-1)= 7.5 miles/hr

That is close to the qualifying time to run in the Boston Marathon (26miles/3.5 hrs (7.5mph)....adjusted for age and gender)

Answer 2

7.5mile