(re)Bonjour,
149,4 km = 149 400
vitesse = distance ÷ temps
donc : temps = distance ÷ distance
= 149 400 ÷ 20
= 7 470 s
7 470 s = 2 × 3 600 + 270 s
= 2 h + 270 s
= 2 h + (4 × 60 s) + 30 s
= 2 h 4 mn 30 s
Bonsoir,
1km=1 000m
1h=3 600s
20m/s=20*3 600m/h=72 000m/h
72 000m/h=72 000:1 000km/h=72km/h
149,4:72=2,075h
0,075h=0,075*60min=4,5min
0,5min=0,5*60s=30s
Il mettra 2h4min30s pour parcourir ce trajet.
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(re)Bonjour,
149,4 km = 149 400
vitesse = distance ÷ temps
donc : temps = distance ÷ distance
= 149 400 ÷ 20
= 7 470 s
7 470 s = 2 × 3 600 + 270 s
= 2 h + 270 s
= 2 h + (4 × 60 s) + 30 s
= 2 h 4 mn 30 s
Bonsoir,
1km=1 000m
1h=3 600s
20m/s=20*3 600m/h=72 000m/h
72 000m/h=72 000:1 000km/h=72km/h
149,4:72=2,075h
0,075h=0,075*60min=4,5min
0,5min=0,5*60s=30s
Il mettra 2h4min30s pour parcourir ce trajet.