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7200x = 3600 / : 7200
x = 1/2 minuty = 30 sekund
600 metrów przejedzie w 30 sekund.
1200:600=2
60s:2=30s
odp. w 30 sekund
s=600m
t=?
v=s/t
t=s/V
t=600m/20(m/s)= 30 s
odp 30 s