Question

1. 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/second.
b) 5 yards/second.
c) 50 yards/second.
d) not enough information

Explanation:

Step1: Recall speed formula

Speed = $\frac{Distance}{Time}$

Step2: Substitute values

Distance = 100 yards, Time = 20 seconds. So Speed = $\frac{100}{20}$

Step3: Calculate result

$\frac{100}{20}=5$ yards/second

Answer:

B. 5 yards/second