Réponse:
Exercice 4:
1) 8-7.30= 30min ou 1/2 heure.
2) V=d÷t=3÷(1÷2)= 6km/h
Exercice 5:
1) 105.88÷3.6≈29.4 m/s
3) 296÷3.6≈82.2 m/s
4) V=d÷t=1681÷24≈70.04 km/h
70.04÷3.6≈19.4 m/s