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20 km = V : 1/4 jam
V = 20 km × 1/4 jam = 5 km/jam
jadi kecepatan rata-rata motor dalam kurun waktu tersebut adalah 20 km/jam
s= 20 km ---> 20×1000= 20000 meter
t= 15×60
t= 900 sekon
Dit:
v=...?
Penye:
v= s/t
v= 20000/900
v= 22,22 m/s