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jaralk : 20 km
A. kecepatan = jarak / waktu
kecepatan = 20 km / 0,25 jam
kecepatan = 80 km/jam
B.
kecepatan = jarak/waktu
80 km / jam = 6 km / waktu
waktu = 6 km / 80 km /jam
waktu = 0,075 jam
waktu = 4,5 menit