F1: X = [3, 5, 6] + t/3·[-3, -6, -1]
X = [3, 5, 6] + 6/3·[-3, -6, -1] = [-3, -7, 4]
|60/3·[-3, -6, -1]| = 20·√46 = 135.6 km/h
F2: X = [4, 2, 3] + (t - 2)/2·[-2, -5, 1]
X = [4, 2, 3] + (6 - 2)/2·[-2, -5, 1] = [0, -8, 5]
|60/2·[-2, -5, 1]| = 30·√30 = 164.3 km/h