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t1 = 5 menit, S1 = 500 m
t2 = 5 menit, S2 = 600 m
t3 = 20 menit, S3 = 1500 m
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Σt = 30 menit, ΣS = 2600 m
Σt = ½ jam, ΣS = 2,6 km
kecepatan rata-rata
v = ΣS / Σt
v = (2,6 km) / (½ jam)
v = 5,2 km/jam ← jwb