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1500m/min (km/h) = 1500 * ( 1/1000 : 1/60 ) km/h = 90 km/h
1500m/min = 1500 * 1/1000 / 1/60 km/h = 1500 * 1/1000 * 60 km/h = 90 km/h
1500m/min=1,5km/(1/60)h=90km/h