bonsoir
a) vitesse = 50 : 25 = 2 km /h
b) 2 000 m = 60 min
275 m = ( 275 x 60) / 2000 = 8.25 min soit 8 minutes 15 s
1 620 m³/h = 1 620 : 3600 = 0.45 m³/s = 450 L/s
1)1 m^3=1000 L Donc 1620 m^3/h=1620 x 24=38880m^3/j 2)50÷25=2km 2km----->1h 2000km---->3600s 1m----->3600S ÷2000=1,8s 275m---->1,8s×275=495s 495s=8x60s+15s=8 minutes 15 secondes
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bonsoir
a) vitesse = 50 : 25 = 2 km /h
b) 2 000 m = 60 min
275 m = ( 275 x 60) / 2000 = 8.25 min soit 8 minutes 15 s
1 620 m³/h = 1 620 : 3600 = 0.45 m³/s = 450 L/s
1)1 m^3=1000 L Donc 1620 m^3/h=1620 x 24=38880m^3/j 2)50÷25=2km 2km----->1h 2000km---->3600s 1m----->3600S ÷2000=1,8s 275m---->1,8s×275=495s 495s=8x60s+15s=8 minutes 15 secondes