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B)1m/s--60m/min
40m/s--?
40*60= 2400m/min
C)100m/s*0.001km/1/3600=0,1*3600/1=360km/h
40m/s = 40*60m/1*60s = 2400m/1min = 2400m/min
100m/s = 100*3600m/3600s = 360000m/1h = 360km/h
1h = 60min = 3600 s
1km = 1000 m