Bonjour
AB = 2 km
DB² = 1.5 ² + 2 ² = 6.25
DB = √ 6.25 = 2.5
Selon le th de Thalès
DC/DE = DB/DF = CB/EF
2/5 = 2.5/DF
DF = ( 5 x 2.25 ) / 2 = 5.625
2/5 = 1.5/EF
Ef = ( 5 x 1.5 ) / 2 = 3.75
2 + 2.5 + 5.625 + 3.5 = 13.625
parcours = 13.625 km
16 km = 60 min
13.625 km = 51 min environ
