bonjour

4 min  → 23 m

60 min → 345 m =  0.345 km /h

30 min  → 1 m

60 m →  2 m  = 0.002 km/h

1.2 x 60 = 72 km /h

1 s → 20.6 m

3600 s → 74 160 m = 74.16 km/ h

4 s → 638 m

3 600 s → 574 200 m = 574 .2 km / h

1 s → 130 m

3 600 s → 468 000 m = 468 km/h

1 s → 464 m

3 600 s → 1 670 400 m  = 1 670 , 4 km/h

Réponse :

bonsoir

100m=9.58s

en km /h

1s=100÷9.58×3.637.6km/h

23m =4mn   4mn= 240 secondes

en km/h

23÷240×3.6=0.345km/h

1m=30mn   30mn=1800s

en km/h

1÷1800×3.6=0.002km/h

1.2km=1mn  1.2 km=1200m  et 1mn=60s

1200÷60×3.6=72 km/h

20.6m/s

20.6×3.6=74.16km/h

638m=4s

638÷4×3.6=574.20km/h

130m=1s

130×3.6=468 km/h

464m=1s

464×3.6=1670.4km/h

Explications étape par étape