Rf = (distance the spot traveled)/L there are four spots, so from the left to the right: Rf = 0.15 Rf = 0.40 Rf = 0.62 Rf = 0.87 Solution Rf = (distance the spot traveled)/L there are four spots, so from the left to the right: Rf = 0.15 Rf = 0.40 Rf = 0.62 Rf = 0.87.