I would choose the formula D (distance to the finish line)=3-2x/2 where x is the distance run so for example for x = 1 km then 2 times 1 = 2/2=1 so D=3-1=2km which is seen to be the logical answer so it seems to corroborate the equation.
Average rate of change [1,3] = (15.882 - 11.38)/(3-1) = 4.502 /2 = 2.251
average rate of change [-4,-2] = (0.0971- 0.0018)/(-2+4) = 0.0953 /2 = 0.04765
average rate of change [1,3] / average rate of change [-4,-2]
= 2.251 / 0.04765
= 47.24
answer
47.24
3/5 in decimal form is 0.6