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V1=s1/t1
s1=x
t1= 3h 12 min= 192 min.
V2=s2/t2
s2=2,5x
t2=y
V1=V2
x/192=2,5x/y /*192
x=480x/y /*y
xy=480x /:x
y=480minut=8h
Odp. 8h