1.5m/s= km/h

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1.5m/s=km/h1.5m/s=km/h1.5m/s=km/h1.5m/s=5.4km/h1.5m/s=5.4km/h1h=60×60=3600s1.5m/s=(1.5×3600/1000)km/

1.5m/s= km/h
1.5m/s= km/h

1.5m/s= km/h
1.5m/s= 5.4km/h

1.5m/s= 5.4km/h

1h=60×60=3600s
1.5m/s=(1.5×3600/1000)km/h=5.4km/h

授之以渔
1.5m/s= 1.5*(3600/1000) km/h