①30S=( )=( )min ②0.2h=( )=( )S ③45min=( )=( )h ④500m=( )=( )

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①30S=( )=( )min ②0.2h=( )=( )S ③45min=( )=( )h ④500m=( )=( )mm
请帮忙``急用`!

①30s=(30/60min )=(0.5 )min
②0.2h=( 0.2*3600S)=(720)s
③45min=(45/60h )=(0.75 )h
④500m=( 500*1000mm)=(500000)mm

1.08km/min=?m/s=?km/h 1.2km/min= m/s或 km/h 如1km/h= m/s 1m/min= km/min . 1m/s=-----cm/min 1km/h=----m/min 3km/min=（）m/s 60m/min=（）km/h 如5km/min= km/h= m/h= km/s= m/s 1km/min=?km/h=?m/h=?km/s= m/s 1m/s=_____m/min=______km/h:15m/s=____km/h 1.5h=------min=-----s,90s=----min=-----h (1)1km/h= km/min =m/s (2)8m/s= m/min =km/s 40m\s=( )km\h 3km\min=( )km\min 0.25h=( )min