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kelajuan rata2 = (150 + 90)Km/(3+2)jam
kelajuan rata2 = 240/5 = 48 Km/jam
*kecepatan rata2 = perpindahan/satuan waktu
kecepatan tata2 = (150-90)Km/(3+2)jam
kecepatan rata2 = 60/5 = 12 Km/jam
semoga membantu :D