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60 km/jam = 3,5 jam
90 km/jam = x jam
90x = 3,5 * 60
90x = 210
x = 210 / 90
x = 21/9 jam
21/9 = 2 3/9 jam
= 2 1/3 jam
1/3 * 60 = 20
= 2 jam 20 menit
jarak=60km/jam×3,5
jarak=210
waktu=jarak:kecepatan
waktu=210 km:90km/jam
waktu=2 jam 20 menit