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900:720=1,25 m/s
1,25m/s=100%
1,25m/s :5=0,25m/s- tyle sie zwiekszy predkosc
1,25m/s+0.25m/s=1,5m/s
15min=60:15=900s
900*1,5=1350m
1350m-900m=450:9=50
Odp: Pokona on droge dluzsza o 50%. Droga wynosi 1350m.