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Mobil Y
Sy = 5t
Mobil X
Sx = 10 (t - 120)
Saat bersusulan, jarak tempuh keduanya sama
Sx = Sy
10 (t - 120) = 5t
10t - 1200 = 5t
5t = 1200
t = 240 s
Mobil X menyusul mobil Y setelah bergerak sejauh
Sx = 10 (240 - 120( = 1200 m = 1,2 km ← jawaban
Sy = 5 (240) = 1200 m = 1,2 km
Ok ?