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15km/h=15000m/3600s=4,2m/s
motocyklista 5m/s
szybciej motocyklista
15km/h= 15*1000/3600=4,16m/s
odp: szybciej jedzie motocyklista
m/s x3,6 --->km/h
km/h :3,6 ---> m/s
:)