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s = 60x2 = 120 km
Jarak ke arah selatan :
s = 70 x 5/7 = 50 km
Jarak terdekat = Perpindahan = Sisi terpanjang segitiga (dengan 2 jarak tersebut sisi lainnya) pada segitiga siku-siku
Sehingga,
d^2 = 120^2 + 50^2
d = 130 km (Jawban)