Question

a sprinter runs 400 meters in 54 seconds. What is the runner's average running rate in meter's per second?

Answer 1

7.407407407407407... (it repeats the 407) 
U just had to divide 400 by 54

Answer 2

you make a proportion. 400/54=x/1
multiply across:
400x=54
Divide by 400:
x=54/400
Answer= 0.135 seconds per meter