Réponse :
somme des ratios : 1+3+7= 11
kayak : 1/11*55=5km
temps :
1km 5km
10min 50min
course à pied : 3/11*55=15km
12km 15km
60min (15*60)/12 =75min
vélo : 7/11*55=35km
21km 35km
60min (60*35)/21=100min
temps total:
50+75+100=225min =3h45min
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Réponse :
somme des ratios : 1+3+7= 11
kayak : 1/11*55=5km
temps :
1km 5km
10min 50min
course à pied : 3/11*55=15km
12km 15km
60min (15*60)/12 =75min
vélo : 7/11*55=35km
21km 35km
60min (60*35)/21=100min
temps total:
50+75+100=225min =3h45min