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20m/s na km/h=72 km/h
12cm/s na dm/m=72 dm / min
42km/h na dm/m =7000 decymetr / minuta
20m/s -20×3600/1000= 72 km/h
12cm/s - 12×60/10 = 72dm/min
42km/h - 42×10000/60 = 7000 dm/min