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jarak tempuh a + jarak tempuh b = jarak total
Va x t + Vb x t = Jarak total
Va = kecepatan a
Vb = kecepatan b
t = waktu
55t+65t=180
120t=180
t=3/2 jam (1,5 jam = 1jm 30 mnt)
Berangkat pukul 07.15 + 1jm 30 menit = 08.45
C jawabannya
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