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7s- x km
...............
x=7×1;3=2⅓km
w odległosci około 2⅓km
x ----- 7s
3x = 7×1
3x = 7
x = 7/3
x= 2⅓
odp. Piorun udrzył o odległości ok. 2 i 1/3 km