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t1=2.10h=130min=7800s
v1=s1/t1
v1=12000m/7800s
v1=1,53m/s
s2=18km=18000m
t2=3,35h=215min=12900s
v2=s2/t2
v2=18000m/12900s
v2=1,4 m/s
z większą szybkością szedł pierwszy podróżnik.