6h=___s=___min 72s=___min
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2.5h=()min=()s 120s=()min=()h
45min=______h=_______s
0.5h= ____min =_____s
0.5h=?min=?s
36min30s=()h
(1)1km/h= km/min =m/s (2)8m/s= m/min =km/s
60km/h=( )m/min300cm/min=( )m/s还有0.3km/h=( )km/min60km/h=( )
1m/s=3.6km/h=多少m/min
5h= s 50km= 微米 300s= min
1km/min=?km/h=?m/h=?km/s= m/s