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S = 15 km
t = 20 menti = 1/3 jam
ditanya
v = ----?
Jawab
v = S/t
= 15 /(1/3)
= 15 x 3
= 45 km/jam
= 20/60 jam
= 1/3 jam
Jarak = 15 km
v = s/t
= 15 : 1/3
= 15 × 3/1
= 45 km/jam
Jadi, kecepatan rata-rata = 45 km/jam