Bonsoir,
1 h -----------> 4 km
donc : 1,5 h -------------> 4 km × 1,5 = 6 km
18 h --------------> 18 ÷ 4 = 4,5 h
5h ----------------> 4 km × 5 = 20 km
30 km --------------> 30 ÷ 4 = 7,5 h
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Bonsoir,
1 h -----------> 4 km
donc : 1,5 h -------------> 4 km × 1,5 = 6 km
18 h --------------> 18 ÷ 4 = 4,5 h
5h ----------------> 4 km × 5 = 20 km
30 km --------------> 30 ÷ 4 = 7,5 h