Cara has driven one-fifth of the total distance, d, to her destination.
In fraction form one-fifth is 1/5
If we divide 1 by 5 we get decimal as 0.2
So we can say that both 1/5 and 0.2 are same.
So this statement explains why both 1/5d and 0.2d can find the distance she has driven:
0.2d is decimal equivalent of 1/5d.
