Honros physics cl experiment dealing with distance velocity and acceleration?

if the toy car i was using took 4.66 seconds to go 90 cm, 4.44 sec to go 80 cm, 3.66 sec to go 70 cm, 3.56 sec to go 60 cm, 3.18 sec to go 50 cm, 2.75 sec to go 40 cm using the V= Df- Di divided by Tf- Ti formula what do i do?