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waktu = 30 menit = 1/2 jam
rumus kecepatan = jarak/waktu
= 20 / 1/2 = 20 x 2/1 = 40 km/jam
jawabannya 40km/jam
smoga bantu :)
dalam waktu=30 mnt
maka
20 km/30 mnt atau 20 km/ 0,5 jam
maka utk jadikan perjam
(20x2) km/(0,5x2) jam
40 km/jam