The total distance the group ran can be represented by d > 400 m
The total distance the group ran can be got by summing up all the individual distances ran by each athlete.
Let the distance the first athlete ran be x
from the question, we know that x >100 m
since all four athletes ran the same distance, the total distance run , d will be four times the distance ran by an athlete.
d > 4 X 100
d > 400 m
