Calculation question in Theory test

A kako se racuna reakcija kocenja ?

There is and a easy way for you, Whenever asking distance travel in second you can use one formula 1Sec. = (speed*.3)m
Like Speed is 100km/hr. than in 1 sec= 100*.3, = 30meters. so in 3 sec.= 30*3=90M.
Hope its helpful for understanding.