On October 13, 2002, British runner Paula Radcliffe set a new world’s record for the women’s marathon. She ran 26.2 miles in 137.3 minutes. The previous world’s record was one minute and 29 seconds slower. What was Radcliffe’s average speed per minute on her record-breaking run? Possible answers are given.
The speed, is one of the magnitudes which identifies the mechanical movement and is defined as the distance traveled per unit of time. The speed value which identifies any movement, regardless of type, is the average velocity, defined as the ratio of the distance (d) traveled in a time interval (t):
v = d/t
Then, the average speed which was developed by Paula Radcliffe was:
v = (26.2)/(137.3)
v = 0.190 miles/minutes
To compare the speeds developed in both marathons, we will calculate the time that was necessary in the previous marathon to cover the same distance.
In the previous marathon the record was:
t1 = t + (1.48) = (137.3) + (1.48)
t1 = 138.78 minutes
Then, the average speed in the previous marathon was:
v = d/t1 = (26.2)/(138.78)
v = 0.188 miles/minutes