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400 dm = 400*0,1 = 40 m
S = V t
t = S/V
36km/h = 36*1000/3600 = 10m/s
t = 40m/10m/s = 4s
2.
V = 200m/50s = 4m/s
4m/s 3600/1000 = 14,4 km/h
:-)