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V1=30÷0,5
V1=60 km/jam
V2=45÷1
V2=45 km/jam
V3=25÷0,5
V3= 50 km/jam
kecepatan rata-rata= V1+V2+V3 / 3
= 60 + 45 + 50 / 3
=155 / 3
= 51,67 km/jam atau bisa dibulatkan menjadi 52 km/jam