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s AB = 30 km
S BC = 15 KM
S CA = 25 KM
t AB = 30 menit = 0,5 jam
t BC = 1 5menit = 0,25 jam
nomor 6 :
Pepindahan :A-C = 25 km (B)
nomor 7 : kelajuan A-C
V = (30+15)/(0,5+0,25)
= 45/0,75
= 60 km/jam (D)