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II sposób :
układam proporcję :
1 m/s = 3,6 km/h
36 m/s = x km/h
x = 36 * 3,6 = 129,6 km/h
lub :
1 m/s = 3,6 km/h
x m/s = 18 km/h
x = 18/3,6 = 5 m/s