Arturo O. answered 04/13/18
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If there are only these 3 given parts of the journey, then the 2 km walk must be 1/4 of the journey, since the other parts add up to 3/4 of the journey.
d = total distance
d/4 = 2 km
d = 8 km
So he went 4 km by rail, 2 km by car, and walked 2 km.