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200m = 0,2 km
t = 0,2 km / 180 km
t = 0,00(1)h = 3,6 s
v=180km/h=50m/s
t=?
v=s/t
t=s/v
t=400m/40m/s=10s
Pociąg przejedzie ten tunel w 10 sekund