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t-szukany czas
s=V*t
s=V*66min
s=6/5V*t
V*66min=6/5V*t
6/5t=66min
t=55min
66 - 100%
x - 20%
(20% * 66) : 100% = 13,2 min.
66 - 13, 2 = 52,8
Pokona w 52 minuty i 80 sekund. Czyli w prawie 53 minuty.