Nellie runs the length of a 100-yard football field in a time of 20 seconds. Her average running speed is
A)1/2 yard/s.
B)5 yards/s.
C)50 yards/s.
D)not enough information

Question

Quizplus · Accepted Answer

To find the average running speed, we divide the distance traveled (100 yards) by the time taken (20 seconds):

Average Speed = Distance/Time 
= 100 yards/20 seconds 
= 5 yards/second

Therefore, Nellie's average running speed is 5 yards/second, which is equivalent to running the length of a football field in 20 seconds. The answer is (B).

Nellie Runs the Length of a 100-Yard Football Field in a Time