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Sagot :

VINS

bonsoir

AB = 2 km

BC = 1.5 km

CD = 2 km

BD² = 1.5² + 2² = 6.25

BD = √6.25 = 2.5 km

DB/DF = DC/DE = BC/EF

2.5 /DF = 2/5

⇔ DF = 6.25

2.5/6.25 = 1.5 /EF

⇔ EF = 3.75

2 + 1.5 + 2 + 5 + 3.75 + 3.5 = 17.75

parcours = 17.75 km

pour faire 12 km il met 60 min

pour faire 2 km = 10 min

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